Add a common ServiceTemplateAutomation parent class

Add a common parent class that Awx/AnsibleTower/TerraformEnterprise can
inherit from.

Author: agrare

app/models/service_automation.rb

@@ -0,0 +1,2 @@
+class ServiceAutomation < Service
+end

app/models/service_template_automation.rb

@@ -0,0 +1,7 @@
+class ServiceTemplateAutomation < ServiceTemplate
+  include ServiceTemplateAutomationMixin
+
+  def generic?
+    prov_type.start_with?("generic_")
+  end
+end

app/models/service_template_awx.rb

@@ -1,12 +1,20 @@
-class ServiceTemplateAwx < ServiceTemplate
+class ServiceTemplateAwx < ServiceTemplateAutomation
   include ServiceConfigurationMixin
-  include ServiceTemplateAutomationMixin
 
   before_update :remove_invalid_resource
 
   alias job_template configuration_script
   alias job_template= configuration_script=
 
+  def create_subtasks(_parent_service_task, _parent_service)
+    if generic?
+      # no sub task is needed for this service
+      []
+    else
+      super
+    end
+  end
+
   def self.create_catalog_item(options, _auth_user = nil)
     transaction do
       create_from_options(options).tap do |service_template|
@@ -31,11 +39,6 @@ def remove_invalid_resource
     end
   end
 
-  def create_subtasks(_parent_service_task, _parent_service)
-    # no sub task is needed for this service
-    []
-  end
-
   def self.default_provisioning_entry_point(_service_type)
     '/AutomationManagement/AnsibleTower/Service/Provisioning/StateMachines/Provision/CatalogItemInitialization'
   end

spec/factories/service_template.rb

@@ -2,9 +2,10 @@
   factory :service_template do
     sequence(:name) { |n| "service_template_#{seq_padded_for_sorting(n)}" }
   end
+  factory :service_template_automation, :class => 'ServiceTemplateAutomation', :parent => :service_template
   factory :service_template_orchestration, :class => 'ServiceTemplateOrchestration', :parent => :service_template
   factory :service_template_ansible_playbook, :class => 'ServiceTemplateAnsiblePlaybook', :parent => :service_template
-  factory :service_template_ansible_tower, :class => 'ServiceTemplateAnsibleTower', :parent => :service_template
+  factory :service_template_ansible_tower, :class => 'ServiceTemplateAnsibleTower', :parent => :service_template_automation
   factory :service_template_container_template, :class => 'ServiceTemplateContainerTemplate', :parent => :service_template
 
   trait :with_provision_resource_action_and_dialog do