Configure Tower in Tower:

* Add separate Django app for configuration: awx.conf.
* Migrate from existing main.TowerSettings model to conf.Setting.
* Add settings wrapper to allow get/set/del via django.conf.settings.
* Update existing references to tower_settings to use django.conf.settings.
* Add a settings registry to allow for each Django app to register configurable settings.
* Support setting validation and conversion using Django REST Framework fields.
* Add /api/v1/settings/ to display a list of setting categories.
* Add /api/v1/settings/<slug>/ to display all settings in a category as a single object.
* Allow PUT/PATCH to update setting singleton, DELETE to reset to defaults.
* Add "all" category to display all settings across categories.
* Add "changed" category to display only settings configured in the database.
* Support per-user settings via "user" category (/api/v1/settings/user/).
* Support defaults for user settings via "user-defaults" category (/api/v1/settings/user-defaults/).
* Update serializer metadata to support category, category_slug and placeholder on OPTIONS responses.
* Update serializer metadata to handle child fields of a list/dict.
* Hide raw data form in browsable API for OPTIONS and DELETE.
* Combine existing licensing code into single "TaskEnhancer" class.
* Move license helper functions from awx.api.license into awx.conf.license.
* Update /api/v1/config/ to read/verify/update license using TaskEnhancer and settings wrapper.
* Add support for caching settings accessed via settings wrapper.
* Invalidate cached settings when Setting model changes or is deleted.
* Preload all database settings into cache on first access via settings wrapper.
* Add support for read-only settings than can update their value depending on other settings.
* Use setting_changed signal whenever a setting changes.
* Register configurable authentication, jobs, system and ui settings.
* Register configurable LDAP, RADIUS and social auth settings.
* Add custom fields and validators for URL, LDAP, RADIUS and social auth settings.
* Rewrite existing validator for Credential ssh_private_key to support validating private keys, certs or combinations of both.
* Get all unit/functional tests working with above changes.
* Add "migrate_to_database_settings" command to determine settings to be migrated into the database and comment them out when set in Python settings files.
* Add support for migrating license key from file to database.
* Remove database-configuable settings from local_settings.py example files.
* Update setup role to no longer install files for database-configurable settings.

f 94ff6ee More settings work.
f af4c4e0 Even more db settings stuff.
f 96ea9c0 More settings, attempt at singleton serializer for settings.
f 937c760 More work on singleton/category views in API, add code to comment out settings in Python files, work on command to migrate settings to database.
f 425b0d3 Minor fixes for sprint demo.
f ea402a4 Add support for read-only settings, cleanup license engine, get license support working with DB settings.
f ec289e4 Rename migration, minor fixmes, update setup role.
f 603640b Rewrite key/cert validator, finish adding social auth fields, hook up signals for setting_changed, use None to imply a setting is not set.
f 67d1b5a Get functional/unit tests passing.
f 2919b62 Flake8 fixes.
f e62f421 Add redbaron to requirements, get file to database migration working (except for license).
f c564508 Add support for migrating license file.
f 982f767 Add support for regex in social map fields.

awx/main/signals.py

@@ -8,6 +8,7 @@ import threading
 import json
 
 # Django
+from django.conf import settings
 from django.db.models.signals import post_save, pre_delete, post_delete, m2m_changed
 from django.dispatch import receiver
 
@@ -21,7 +22,6 @@ from awx.api.serializers import * # noqa
 from awx.main.utils import model_instance_diff, model_to_dict, camelcase_to_underscore, emit_websocket_notification
 from awx.main.utils import ignore_inventory_computed_fields, ignore_inventory_group_removal, _inventory_updates
 from awx.main.tasks import update_inventory_computed_fields
-from awx.main.conf import tower_settings
 
 __all__ = []
 
@@ -297,10 +297,10 @@ def update_host_last_job_after_job_deleted(sender, **kwargs):
 
 class ActivityStreamEnabled(threading.local):
     def __init__(self):
-        self.enabled = getattr(tower_settings, 'ACTIVITY_STREAM_ENABLED', True)
+        self.enabled = True
 
     def __nonzero__(self):
-        return bool(self.enabled)
+        return bool(self.enabled and getattr(settings, 'ACTIVITY_STREAM_ENABLED', True))
 
 activity_stream_enabled = ActivityStreamEnabled()
 
@@ -330,7 +330,6 @@ model_serializer_mapping = {
     JobTemplate: JobTemplateSerializer,
     Job: JobSerializer,
     AdHocCommand: AdHocCommandSerializer,
-    TowerSettings: TowerSettingsSerializer,
     NotificationTemplate: NotificationTemplateSerializer,
     Notification: NotificationSerializer,
 }
@@ -354,7 +353,7 @@ def activity_stream_create(sender, instance, created, **kwargs):
         #TODO: Weird situation where cascade SETNULL doesn't work
         #      it might actually be a good idea to remove all of these FK references since
         #      we don't really use them anyway.
-        if type(instance) is not TowerSettings:
+        if instance._meta.model_name != 'setting':  # Is not conf.Setting instance
             getattr(activity_entry, object1).add(instance)
 
 def activity_stream_update(sender, instance, **kwargs):
@@ -377,7 +376,7 @@ def activity_stream_update(sender, instance, **kwargs):
         object1=object1,
         changes=json.dumps(changes))
     activity_entry.save()
-    if type(instance) is not TowerSettings:
+    if instance._meta.model_name != 'setting':  # Is not conf.Setting instance
         getattr(activity_entry, object1).add(instance)
 
 def activity_stream_delete(sender, instance, **kwargs):