Merge branch 'purge_ansible_name' into release_3.2.0

* purge_ansible_name:
  Remove ansible reference from dev PKG-INFO
  Add back in PRIVILEGE_ESCALATION_METHODS inadvertantly removed
  Add awx_ and AWX_ environment vars and extra_vars alongside Tower
  Refactor some tower periodic tasks to label as awx
  Refactor Notification backend for tower -> awx
  Refactor fact cache plugin from tower -> awx
  Rename tower display plugins to awx display
  Mass rename from ansible_(awx|tower) -> (awx|tower)

awx/plugins/callback/awx_display.py

@@ -27,4 +27,4 @@ if awx_lib_path not in sys.path:
     sys.path.insert(0, awx_lib_path)
 
 # Tower Display Callback
-from tower_display_callback import TowerDefaultCallbackModule as CallbackModule  # noqa
+from awx_display_callback import AWXDefaultCallbackModule as CallbackModule  # noqa

awx/plugins/callback/minimal.py

@@ -27,4 +27,4 @@ if awx_lib_path not in sys.path:
     sys.path.insert(0, awx_lib_path)
 
 # Tower Display Callback
-from tower_display_callback import TowerMinimalCallbackModule as CallbackModule  # noqa
+from awx_display_callback import AWXMinimalCallbackModule as CallbackModule  # noqa