Change CloudManager::AuthKeyPair to inherit from Authentication

To prevent cloud_manager auth_key_pairs from being returned with other
AuthPrivateKeys change the parent class to Authentication

app/models/manageiq/providers/cloud_manager.rb

@@ -27,7 +27,7 @@ class << model_name
     has_many :cloud_object_store_objects,    :foreign_key => :ems_id, :dependent => :destroy
     has_many :cloud_services,                :foreign_key => :ems_id, :dependent => :destroy
     has_many :cloud_databases,               :foreign_key => :ems_id, :dependent => :destroy
-    has_many :key_pairs,                     :class_name  => "AuthPrivateKey", :as => :resource, :dependent => :destroy
+    has_many :key_pairs,                     :class_name  => "AuthKeyPair", :as => :resource, :dependent => :destroy
     has_many :host_aggregates,               :foreign_key => :ems_id, :dependent => :destroy
     has_one  :source_tenant, :as => :source, :class_name  => 'Tenant'
     has_many :vm_and_template_labels,        :through     => :vms_and_templates, :source => :labels

app/models/manageiq/providers/cloud_manager/auth_key_pair.rb

@@ -1,4 +1,4 @@
-class ManageIQ::Providers::CloudManager::AuthKeyPair < ::AuthPrivateKey
+class ManageIQ::Providers::CloudManager::AuthKeyPair < ::Authentication
   include AvailabilityMixin
 
   acts_as_miq_taggable

app/models/manageiq/providers/cloud_manager/provision/options_helper.rb

@@ -4,7 +4,7 @@ def dest_availability_zone
   end
 
   def guest_access_key_pair
-    @guest_access_key_pair ||= AuthPrivateKey.find_by(:id => get_option(:guest_access_key_pair))
+    @guest_access_key_pair ||= Authentication.find_by(:id => get_option(:guest_access_key_pair))
   end
 
   def security_groups