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/tests/unit/utils/test_ha.py

@@ -17,7 +17,7 @@ from awx.main.utils.ha import (
 @pytest.fixture
 def conf():
     class Conf():
-        CELERY_ROUTES = dict()
+        CELERY_TASK_ROUTES = dict()
         CELERYBEAT_SCHEDULE = dict()
     return Conf()
 
@@ -87,14 +87,14 @@ class TestUpdateCeleryWorkerRoutes():
         instance.is_controller = mocker.MagicMock(return_value=is_controller)
 
         assert update_celery_worker_routes(instance, conf) == expected_routes
-        assert conf.CELERY_ROUTES == expected_routes
+        assert conf.CELERY_TASK_ROUTES == expected_routes
 
     def test_update_celery_worker_routes_deleted(self, mocker, conf):
         instance = mocker.MagicMock()
         instance.hostname = 'east-1'
         instance.is_controller = mocker.MagicMock(return_value=False)
-        conf.CELERY_ROUTES = {'awx.main.tasks.awx_isolated_heartbeat': 'foobar'}
+        conf.CELERY_TASK_ROUTES = {'awx.main.tasks.awx_isolated_heartbeat': 'foobar'}
 
         update_celery_worker_routes(instance, conf)
-        assert 'awx.main.tasks.awx_isolated_heartbeat' not in conf.CELERY_ROUTES
+        assert 'awx.main.tasks.awx_isolated_heartbeat' not in conf.CELERY_TASK_ROUTES