Updates for automatic triggering of policies

* Switch policy router queue to not be "tower" so that we don't
  fall into a chicken/egg scenario
* Show fixed policy list in serializer so a user can determine if
  an instance is manually managed
* Change IG membership mixin to not directly handle applying topology
  changes. Instead it just makes sure the policy instance list is
  accurate
* Add create/delete hooks for instances and groups to trigger policy
  re-evaluation
* Update policy algorithm for fairer distribution
* Fix an issue where CELERY_ROUTES wasn't renamed after celery/django
  upgrade
* Update unit tests to be more explicit
* Update count calculations used by algorithm to only consider
  non-manual instances
* Adding unit tests and fixture
* Don't propagate logging messages from awx.main.tasks and
  awx.main.scheduler
* Use advisory lock to prevent policy eval conflicts
* Allow updating instance groups from view

awx/main/migrations/0018_v330_instancegroup_policies.py

@@ -8,14 +8,15 @@ import awx.main.fields
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('main', '0008_v320_drop_v1_credential_fields'),
+        ('main', '0017_v330_move_deprecated_stdout'),
     ]
 
     operations = [
         migrations.AddField(
             model_name='instancegroup',
             name='policy_instance_list',
-            field=awx.main.fields.JSONField(default=[], help_text='List of exact-match Instances that will always be automatically assigned to this group', blank=True),
+            field=awx.main.fields.JSONField(default=[], help_text='List of exact-match Instances that will always be automatically assigned to this group',
+                                            blank=True),
         ),
         migrations.AddField(
             model_name='instancegroup',