diff --git a/app/models/manageiq/providers/openstack/cloud_manager.rb b/app/models/manageiq/providers/openstack/cloud_manager.rb
index 326b20536..622d32289 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager.rb
@@ -1,28 +1,4 @@
 class ManageIQ::Providers::Openstack::CloudManager < ManageIQ::Providers::CloudManager
-  require_nested :AuthKeyPair
-  require_nested :AvailabilityZone
-  require_nested :AvailabilityZoneNull
-  require_nested :CloudResourceQuota
-  require_nested :CloudTenant
-  require_nested :EventCatcher
-  require_nested :EventParser
-  require_nested :Flavor
-  require_nested :HostAggregate
-  require_nested :MetricsCapture
-  require_nested :MetricsCollectorWorker
-  require_nested :OrchestrationServiceOptionConverter
-  require_nested :OrchestrationStack
-  require_nested :OrchestrationTemplate
-  require_nested :VnfdTemplate
-  require_nested :PlacementGroup
-  require_nested :Provision
-  require_nested :ProvisionWorkflow
-  require_nested :Refresher
-  require_nested :RefreshWorker
-  require_nested :Snapshot
-  require_nested :Template
-  require_nested :Vm
-
   has_one :network_manager,
           :foreign_key => :parent_ems_id,
           :class_name  => "ManageIQ::Providers::Openstack::NetworkManager",
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/event_catcher.rb b/app/models/manageiq/providers/openstack/cloud_manager/event_catcher.rb
index 4d8840a90..4840018b4 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/event_catcher.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/event_catcher.rb
@@ -1,5 +1,3 @@
 class ManageIQ::Providers::Openstack::CloudManager::EventCatcher < ::MiqEventCatcher
   include ManageIQ::Providers::Openstack::EventCatcherMixin
-
-  require_nested :Runner
 end
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/metrics_collector_worker.rb b/app/models/manageiq/providers/openstack/cloud_manager/metrics_collector_worker.rb
index bfca8c687..81f70fcae 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/metrics_collector_worker.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/metrics_collector_worker.rb
@@ -1,6 +1,4 @@
 class ManageIQ::Providers::Openstack::CloudManager::MetricsCollectorWorker < ::MiqEmsMetricsCollectorWorker
-  require_nested :Runner
-
   self.default_queue_name = "openstack"
 
   def friendly_name
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/orchestration_stack.rb b/app/models/manageiq/providers/openstack/cloud_manager/orchestration_stack.rb
index 2860cbb6b..4296decb7 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/orchestration_stack.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/orchestration_stack.rb
@@ -1,6 +1,5 @@
 class ManageIQ::Providers::Openstack::CloudManager::OrchestrationStack < ManageIQ::Providers::CloudManager::OrchestrationStack
   include ManageIQ::Providers::Openstack::HelperMethods
-  require_nested :Status
 
   def self.raw_create_stack(orchestration_manager, stack_name, template, options = {})
     create_options = {:stack_name => stack_name, :template => template.content}.merge(options).except(:tenant_name)
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/refresh_worker.rb b/app/models/manageiq/providers/openstack/cloud_manager/refresh_worker.rb
index b4447d9fa..5ca17b224 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/refresh_worker.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/refresh_worker.rb
@@ -1,3 +1,2 @@
 class ManageIQ::Providers::Openstack::CloudManager::RefreshWorker < ::MiqEmsRefreshWorker
-  require_nested :Runner
 end
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/scanning.rb b/app/models/manageiq/providers/openstack/cloud_manager/scanning.rb
index fb705e2b4..5cd9dadc2 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/scanning.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/scanning.rb
@@ -1,3 +1,2 @@
 class ManageIQ::Providers::Openstack::CloudManager::Scanning
-  require_nested :Job
 end
diff --git a/app/models/manageiq/providers/openstack/cloud_manager/vnf.rb b/app/models/manageiq/providers/openstack/cloud_manager/vnf.rb
index 346eab67c..d14511acc 100644
--- a/app/models/manageiq/providers/openstack/cloud_manager/vnf.rb
+++ b/app/models/manageiq/providers/openstack/cloud_manager/vnf.rb
@@ -1,6 +1,5 @@
 class ManageIQ::Providers::Openstack::CloudManager::Vnf < ManageIQ::Providers::CloudManager::OrchestrationStack
   include ManageIQ::Providers::Openstack::HelperMethods
-  require_nested :Status
 
   def self.raw_create_stack(orchestration_manager, stack_name, template, options = {})
     create_options = {:vnf => {:name => stack_name, :vnfd_id => template.ems_ref}}
diff --git a/app/models/manageiq/providers/openstack/infra_manager.rb b/app/models/manageiq/providers/openstack/infra_manager.rb
index 41beb14c6..1e3d90cb5 100644
--- a/app/models/manageiq/providers/openstack/infra_manager.rb
+++ b/app/models/manageiq/providers/openstack/infra_manager.rb
@@ -1,17 +1,4 @@
 class ManageIQ::Providers::Openstack::InfraManager < ManageIQ::Providers::InfraManager
-  require_nested :AuthKeyPair
-  require_nested :Cluster
-  require_nested :EventCatcher
-  require_nested :EventParser
-  require_nested :Host
-  require_nested :HostServiceGroup
-  require_nested :MetricsCapture
-  require_nested :MetricsCollectorWorker
-  require_nested :OrchestrationStack
-  require_nested :Refresher
-  require_nested :RefreshWorker
-  require_nested :Template
-
   include ManageIQ::Providers::Openstack::ManagerMixin
   include HasManyOrchestrationStackMixin
   include HasNetworkManagerMixin
diff --git a/app/models/manageiq/providers/openstack/infra_manager/event_catcher.rb b/app/models/manageiq/providers/openstack/infra_manager/event_catcher.rb
index 2e39cd16c..9a27a411c 100644
--- a/app/models/manageiq/providers/openstack/infra_manager/event_catcher.rb
+++ b/app/models/manageiq/providers/openstack/infra_manager/event_catcher.rb
@@ -1,8 +1,6 @@
 class ManageIQ::Providers::Openstack::InfraManager::EventCatcher < ::MiqEventCatcher
   include ManageIQ::Providers::Openstack::EventCatcherMixin
 
-  require_nested :Runner
-
   def self.settings_name
     :event_catcher_openstack_infra
   end
diff --git a/app/models/manageiq/providers/openstack/infra_manager/metrics_collector_worker.rb b/app/models/manageiq/providers/openstack/infra_manager/metrics_collector_worker.rb
index bed99c781..e2270dc8f 100644
--- a/app/models/manageiq/providers/openstack/infra_manager/metrics_collector_worker.rb
+++ b/app/models/manageiq/providers/openstack/infra_manager/metrics_collector_worker.rb
@@ -1,6 +1,4 @@
 class ManageIQ::Providers::Openstack::InfraManager::MetricsCollectorWorker < ::MiqEmsMetricsCollectorWorker
-  require_nested :Runner
-
   self.default_queue_name = "openstack_infra"
 
   def friendly_name
diff --git a/app/models/manageiq/providers/openstack/infra_manager/refresh_worker.rb b/app/models/manageiq/providers/openstack/infra_manager/refresh_worker.rb
index 4a560f268..1e2a4773e 100644
--- a/app/models/manageiq/providers/openstack/infra_manager/refresh_worker.rb
+++ b/app/models/manageiq/providers/openstack/infra_manager/refresh_worker.rb
@@ -1,6 +1,4 @@
 class ManageIQ::Providers::Openstack::InfraManager::RefreshWorker < ::MiqEmsRefreshWorker
-  require_nested :Runner
-
   def self.settings_name
     :ems_refresh_worker_openstack_infra
   end
diff --git a/app/models/manageiq/providers/openstack/inventory.rb b/app/models/manageiq/providers/openstack/inventory.rb
index 486ad88b1..ea99d47c0 100644
--- a/app/models/manageiq/providers/openstack/inventory.rb
+++ b/app/models/manageiq/providers/openstack/inventory.rb
@@ -1,8 +1,4 @@
 class ManageIQ::Providers::Openstack::Inventory < ManageIQ::Providers::Inventory
-  require_nested :Collector
-  require_nested :Parser
-  require_nested :Persister
-
   # Default manager for building collector/parser/persister classes
   # when failed to get class name from refresh target automatically
   def self.default_manager_name
diff --git a/app/models/manageiq/providers/openstack/inventory/collector.rb b/app/models/manageiq/providers/openstack/inventory/collector.rb
index 95f493f89..b5656fa5a 100644
--- a/app/models/manageiq/providers/openstack/inventory/collector.rb
+++ b/app/models/manageiq/providers/openstack/inventory/collector.rb
@@ -2,11 +2,6 @@ class ManageIQ::Providers::Openstack::Inventory::Collector < ManageIQ::Providers
   include ManageIQ::Providers::Openstack::RefreshParserCommon::HelperMethods
   include Vmdb::Logging
 
-  require_nested :CloudManager
-  require_nested :NetworkManager
-  require_nested :StorageManager
-  require_nested :TargetCollection
-
   attr_reader :availability_zones
   attr_reader :cloud_services
   attr_reader :tenants
diff --git a/app/models/manageiq/providers/openstack/inventory/collector/storage_manager.rb b/app/models/manageiq/providers/openstack/inventory/collector/storage_manager.rb
index ad2f9b396..098e6b76c 100644
--- a/app/models/manageiq/providers/openstack/inventory/collector/storage_manager.rb
+++ b/app/models/manageiq/providers/openstack/inventory/collector/storage_manager.rb
@@ -1,4 +1,2 @@
 module ManageIQ::Providers::Openstack::Inventory::Collector::StorageManager
-  require_nested :CinderManager
-  require_nested :SwiftManager
 end
diff --git a/app/models/manageiq/providers/openstack/inventory/parser.rb b/app/models/manageiq/providers/openstack/inventory/parser.rb
index 3a406c929..c8abe54e8 100644
--- a/app/models/manageiq/providers/openstack/inventory/parser.rb
+++ b/app/models/manageiq/providers/openstack/inventory/parser.rb
@@ -1,9 +1,4 @@
 class ManageIQ::Providers::Openstack::Inventory::Parser < ManageIQ::Providers::Inventory::Parser
-  require_nested :CloudManager
-  require_nested :InfraManager
-  require_nested :NetworkManager
-  require_nested :StorageManager
-
   def orchestration_stack_parameters(stack, stack_inventory_object)
     collector.orchestration_parameters(stack).each do |param_key, param_val|
       uid = compose_ems_ref(stack.id, param_key)
diff --git a/app/models/manageiq/providers/openstack/inventory/parser/storage_manager.rb b/app/models/manageiq/providers/openstack/inventory/parser/storage_manager.rb
index 70d1f066e..9cccbf196 100644
--- a/app/models/manageiq/providers/openstack/inventory/parser/storage_manager.rb
+++ b/app/models/manageiq/providers/openstack/inventory/parser/storage_manager.rb
@@ -1,4 +1,2 @@
 module ManageIQ::Providers::Openstack::Inventory::Parser::StorageManager
-  require_nested :CinderManager
-  require_nested :SwiftManager
 end
diff --git a/app/models/manageiq/providers/openstack/inventory/persister.rb b/app/models/manageiq/providers/openstack/inventory/persister.rb
index c8472966e..7fce35dd9 100644
--- a/app/models/manageiq/providers/openstack/inventory/persister.rb
+++ b/app/models/manageiq/providers/openstack/inventory/persister.rb
@@ -1,10 +1,4 @@
 class ManageIQ::Providers::Openstack::Inventory::Persister < ManageIQ::Providers::Inventory::Persister
-  require_nested :CloudManager
-  require_nested :InfraManager
-  require_nested :NetworkManager
-  require_nested :StorageManager
-  require_nested :TargetCollection
-
   # TODO(lsmola) figure out a way to pass collector info, probably via target, then remove the below
   attr_reader :collector
 
diff --git a/app/models/manageiq/providers/openstack/inventory/persister/storage_manager.rb b/app/models/manageiq/providers/openstack/inventory/persister/storage_manager.rb
index c0d754425..8d2a196e9 100644
--- a/app/models/manageiq/providers/openstack/inventory/persister/storage_manager.rb
+++ b/app/models/manageiq/providers/openstack/inventory/persister/storage_manager.rb
@@ -1,4 +1,2 @@
 module ManageIQ::Providers::Openstack::Inventory::Persister::StorageManager
-  require_nested :CinderManager
-  require_nested :SwiftManager
 end
diff --git a/app/models/manageiq/providers/openstack/network_manager.rb b/app/models/manageiq/providers/openstack/network_manager.rb
index c7abea4da..66b50affa 100644
--- a/app/models/manageiq/providers/openstack/network_manager.rb
+++ b/app/models/manageiq/providers/openstack/network_manager.rb
@@ -1,14 +1,4 @@
 class ManageIQ::Providers::Openstack::NetworkManager < ManageIQ::Providers::NetworkManager
-  require_nested :CloudNetwork
-  require_nested :CloudSubnet
-  require_nested :EventCatcher
-  require_nested :EventParser
-  require_nested :FloatingIp
-  require_nested :NetworkPort
-  require_nested :NetworkRouter
-  require_nested :Refresher
-  require_nested :SecurityGroup
-
   include ManageIQ::Providers::Openstack::ManagerMixin
   include SupportsFeatureMixin
 
diff --git a/app/models/manageiq/providers/openstack/network_manager/cloud_network.rb b/app/models/manageiq/providers/openstack/network_manager/cloud_network.rb
index 2595b1cbf..3ee881ed3 100644
--- a/app/models/manageiq/providers/openstack/network_manager/cloud_network.rb
+++ b/app/models/manageiq/providers/openstack/network_manager/cloud_network.rb
@@ -456,9 +456,6 @@ def params_for_update
     }
   end
 
-  require_nested :Private
-  require_nested :Public
-
   def self.class_by_ems(ext_management_system, external = false)
     external ? super::Public : super::Private
   end
diff --git a/app/models/manageiq/providers/openstack/network_manager/event_catcher.rb b/app/models/manageiq/providers/openstack/network_manager/event_catcher.rb
index ea6357900..852e2990d 100644
--- a/app/models/manageiq/providers/openstack/network_manager/event_catcher.rb
+++ b/app/models/manageiq/providers/openstack/network_manager/event_catcher.rb
@@ -1,8 +1,6 @@
 class ManageIQ::Providers::Openstack::NetworkManager::EventCatcher < ::MiqEventCatcher
   include ManageIQ::Providers::Openstack::EventCatcherMixin
 
-  require_nested :Runner
-
   def self.settings_name
     :event_catcher_openstack_network
   end
diff --git a/app/models/manageiq/providers/openstack/storage_manager/cinder_manager.rb b/app/models/manageiq/providers/openstack/storage_manager/cinder_manager.rb
index 29ce4cb2b..96ecd6ae7 100644
--- a/app/models/manageiq/providers/openstack/storage_manager/cinder_manager.rb
+++ b/app/models/manageiq/providers/openstack/storage_manager/cinder_manager.rb
@@ -1,12 +1,4 @@
 class ManageIQ::Providers::Openstack::StorageManager::CinderManager < ManageIQ::Providers::StorageManager
-  require_nested :CloudVolume
-  require_nested :CloudVolumeBackup
-  require_nested :CloudVolumeSnapshot
-  require_nested :CloudVolumeType
-  require_nested :Refresher
-  require_nested :EventCatcher
-  require_nested :EventParser
-
   include ManageIQ::Providers::StorageManager::BlockMixin
   include ManageIQ::Providers::Openstack::ManagerMixin
 
diff --git a/app/models/manageiq/providers/openstack/storage_manager/cinder_manager/event_catcher.rb b/app/models/manageiq/providers/openstack/storage_manager/cinder_manager/event_catcher.rb
index a28774a41..547d4d567 100644
--- a/app/models/manageiq/providers/openstack/storage_manager/cinder_manager/event_catcher.rb
+++ b/app/models/manageiq/providers/openstack/storage_manager/cinder_manager/event_catcher.rb
@@ -1,8 +1,6 @@
 class ManageIQ::Providers::Openstack::StorageManager::CinderManager::EventCatcher < ::MiqEventCatcher
   include ManageIQ::Providers::Openstack::EventCatcherMixin
 
-  require_nested :Runner
-
   def self.settings_name
     :event_catcher_openstack_cinder
   end
diff --git a/app/models/manageiq/providers/openstack/storage_manager/swift_manager.rb b/app/models/manageiq/providers/openstack/storage_manager/swift_manager.rb
index 164d68409..48440affe 100644
--- a/app/models/manageiq/providers/openstack/storage_manager/swift_manager.rb
+++ b/app/models/manageiq/providers/openstack/storage_manager/swift_manager.rb
@@ -1,8 +1,4 @@
 class ManageIQ::Providers::Openstack::StorageManager::SwiftManager < ManageIQ::Providers::StorageManager
-  require_nested :CloudObjectStoreContainer
-  require_nested :CloudObjectStoreObject
-  require_nested :Refresher
-
   include ManageIQ::Providers::StorageManager::ObjectMixin
 
   delegate :authentication_check,