Add in more model changes around execution environments

- a new unique name field to EE
- a new configure-Tower-in-Tower setting DEFAULT_EXECUTION_ENVIRONMENT
- an Org-level execution_environment_admin_role
- a default_environment field on Project
- a new Container Registry credential type
- order EEs by reverse of the created timestamp
- a method to resolve which EE to use on jobs

awx/main/models/credential/__init__.py

@@ -1133,7 +1133,6 @@ ManagedCredentialType(
     },
 )
 
-
 ManagedCredentialType(
     namespace='kubernetes_bearer_token',
     kind='kubernetes',
@@ -1165,6 +1164,37 @@ ManagedCredentialType(
     }
 )
 
+ManagedCredentialType(
+    namespace='registry',
+    kind='registry',
+    name=ugettext_noop('Container Registry'),
+    inputs={
+        'fields': [{
+            'id': 'host',
+            'label': ugettext_noop('Authentication URL'),
+            'type': 'string',
+            'help_text': ugettext_noop('Authentication endpoint for the container registry.'),
+        }, {
+            'id': 'username',
+            'label': ugettext_noop('Username'),
+            'type': 'string',
+        }, {
+            'id': 'password',
+            'label': ugettext_noop('Password'),
+            'type': 'string',
+            'secret': True,
+        }, {
+            'id': 'token',
+            'label': ugettext_noop('Access Token'),
+            'type': 'string',
+            'secret': True,
+            'help_text': ugettext_noop('A token to use to authenticate with. '
+                                       'This should not be set if username/password are being used.'),
+        }],
+        'required': ['host'],
+    }
+)
+
 
 ManagedCredentialType(
     namespace='galaxy_api_token',