Drop require_nested from providers guides

Author: agrare

providers/events.md

@@ -47,7 +47,6 @@ First we need to set up the worker scaffolding so that we can run our event catc
 `app/models/manageiq/providers/awesome_cloud/cloud_manager/event_catcher.rb`
 ```ruby
 class ManageIQ::Providers::AwesomeCloud::CloudManager::EventCatcher < ManageIQ::Providers::BaseManager::EventCatcher
-  require_nested :Runner
 end
 ```
 

providers/subclassing_an_existing_provider.md

@@ -74,8 +74,6 @@ Now we can start defining our main manager class that will inherit from OpenStac
 ManageIQ::Providers::Openstack::CloudManager.include(ActsAsStiLeafClass)
 
 class ManageIQ::Providers::AwesomePrivateCloud::CloudManager < ManageIQ::Providers::Openstack::CloudManager
-  require_nested :RefreshWorker
-
   supports :create
 
   def self.vm_vendor
@@ -149,27 +147,13 @@ ManageIQ::Providers::Openstack::CloudManager::AuthKeyPair.include(ActsAsStiLeafC
 class ManageIQ::Providers::AwesomePrivateCloud::CloudManager::AuthKeyPair < ManageIQ::Providers::Openstack::CloudManager::AuthKeyPair
 end
 ```
-Followed by a `require_nested :AuthKeyPair` in `ManageIQ::Providers::AwesomePrivateCloud::CloudManager`.
 
 Rinse and repeat until, in this example, you have:
 ```
 ManageIQ::Providers::Openstack::CloudManager.include(ActsAsStiLeafClass)
 
 class ManageIQ::Providers::AwesomePrivateCloud::CloudManager < ManageIQ::Providers::Openstack::CloudManager
-  require_nested :AuthKeyPair
-  require_nested :AvailabilityZone
-  require_nested :AvailabilityZoneNull
-  require_nested :CloudResourceQuota
-  require_nested :CloudTenant
-  require_nested :EventCatcher
-  require_nested :Flavor
-  require_nested :HostAggregate
-  require_nested :MetricsCapture
-  require_nested :MetricsCollectorWorker
-  require_nested :OrchestrationStack
-  require_nested :RefreshWorker
-  require_nested :Template
-  require_nested :Vm
+end
 ```
 
 Now repeat the process for the `NetworkManager` and `StorageManager::CinderManager`

providers/targeted_refresh.md

@@ -44,8 +44,6 @@ class ManageIQ::Providers::AwesomeCloud::Inventory::Persister::TargetCollection
 end
 ```
 
-And don't forget to add `require_nested :TargetCollection` to `app/models/manageiq/providers/awesome_cloud/inventory/collector.rb`, `app/models/manageiq/providers/awesome_cloud/inventory/parser.rb`, and `app/models/manageiq/providers/awesome_cloud/inventory/persister.rb`
-
 We also have to add a configuration setting to enable/disable targeted refresh in your provider's `config/settings.yml`:
 ```
 :ems_refresh:

providers/writing_a_new_provider.md

@@ -393,10 +393,6 @@ First let's declare the collections that we intend to use.  The full set of poss
 
 ```ruby
 class ManageIQ::Providers::AwesomeCloud::Inventory::Persister < ManageIQ::Providers::Inventory::Persister
-  # This should already be here from the generator, you just need one empty subclass
-  # for each child-manager type that your provider has (e.g. NetworkManager and/or StorageManager).
-  require_nested :CloudManager
-
   # Add the list of inventory collections that you want to use here
   # In the future if you want to add more inventory like disks or networks you would
   # add them to the list here.
@@ -416,8 +412,6 @@ The collector provides an interface for the parser, so each method should fetch
 
 ```ruby
 class ManageIQ::Providers::AwesomeCloud::Inventory::Collector < ManageIQ::Providers::Inventory::Collector
-  require_nested :CloudManager
-
   def images
     compute_client.get_images
   end
@@ -444,8 +438,6 @@ Now we can get started on the parser.
 
 ```ruby
 class ManageIQ::Providers::AwesomeCloud::Inventory::Parser < ManageIQ::Providers::Inventory::Parser
-  require_nested :CloudManager
-
   def parse
     instance_types
     images