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

installer/image_build/files/launch_awx_task.sh

@@ -19,5 +19,5 @@ else
     awx-manage create_preload_data
 fi
 awx-manage provision_instance --hostname=$(hostname)
-awx-manage register_queue --queuename=tower --hostnames=$(hostname)
+awx-manage register_queue --queuename=tower --instance_percent=100
 supervisord -c /supervisor_task.conf