Delay load manageiq-api-client until needed

We can require this when needed instead of eager loading it when Vm or other
models load it.

app/models/mixins/inter_region_api_method_relay.rb

@@ -1,5 +1,3 @@
-require 'manageiq-api-client'
-
 module InterRegionApiMethodRelay
   class InterRegionApiMethodRelayError < RuntimeError; end
 
@@ -54,6 +52,7 @@ def api_relay_class_method(method, action = method)
   end
 
   def self.api_client_connection_for_region(region_number, user = User.current_userid)
+    require 'manageiq-api-client'
     region = MiqRegion.find_by(:region => region_number)
 
     url = region.remote_ws_url

app/models/mixins/process_tasks_mixin.rb

@@ -1,5 +1,3 @@
-require 'manageiq-api-client'
-
 module ProcessTasksMixin
   extend ActiveSupport::Concern
   include RetirementMixin
@@ -128,6 +126,7 @@ def invoke_api_tasks(api_client, remote_options)
     end
 
     def send_action(action, collection_name, collection, remote_options, id = nil)
+      require 'manageiq-api-client'
       post_args = remote_options[:args] || {}
       begin
         if id.present?

spec/models/mixins/inter_region_api_method_relay_spec.rb

@@ -1,3 +1,5 @@
+require 'manageiq-api-client'
+
 RSpec.describe InterRegionApiMethodRelay do
   let(:collection_name) { :test_class_collection }
   let(:api_config)      { double("Api::CollectionConfig") }

spec/models/mixins/process_tasks_mixin_spec.rb

@@ -1,3 +1,5 @@
+require 'manageiq-api-client'
+
 RSpec.describe ProcessTasksMixin do
   let(:test_class) do
     Class.new(ApplicationRecord) do