Include Tower configurations into activity stream

Relates #7386 of ansible-tower.

Due to the uniqueness of Tower configuration datastore model, it is not
fully compatible with activity stream workflow. This PR introduced
setting field for activitystream model along with other changes to make
Tower configuration a special case for activity streams.

Signed-off-by: Aaron Tan <jangsutsr@gmail.com>

awx/conf/utils.py

@@ -9,7 +9,10 @@ import shutil
 # RedBaron
 from redbaron import RedBaron, indent
 
-__all__ = ['comment_assignments']
+# AWX
+from awx.conf.registry import settings_registry
+
+__all__ = ['comment_assignments', 'conf_to_dict']
 
 
 def comment_assignments(patterns, assignment_names, dry_run=True, backup_suffix='.old'):
@@ -103,6 +106,13 @@ def comment_assignments_in_file(filename, assignment_names, dry_run=True, backup
     return '\n'.join(diff_lines)
 
 
+def conf_to_dict(obj):
+    return {
+        'category': settings_registry.get_setting_category(obj.key),
+        'name': obj.key,
+    }
+
+
 if __name__ == '__main__':
     pattern = os.path.join(os.path.dirname(__file__), '..', 'settings', 'local_*.py')
     diffs = comment_assignments(pattern, ['AUTH_LDAP_ORGANIZATION_MAP'])