Replace logging-related restart with dynamic handler

refactor existing handlers to be the related
  "real" handler classes, which are swapped
  out dynamically by external logger "proxy" handler class

real handler swapout only done on setting change

remove restart_local_services method
get rid of uWSGI fifo file

change TCP/UDP return type contract so that it mirrors
  the request futures object
add details to socket error messages

awx/conf/views.py

@@ -21,7 +21,7 @@ from awx.api.generics import *  # noqa
 from awx.api.permissions import IsSuperUser
 from awx.api.versioning import reverse, get_request_version
 from awx.main.utils import *  # noqa
-from awx.main.utils.handlers import BaseHTTPSHandler, UDPHandler, LoggingConnectivityException
+from awx.main.utils.handlers import AWXProxyHandler, LoggingConnectivityException
 from awx.main.tasks import handle_setting_changes
 from awx.conf.license import get_licensed_features
 from awx.conf.models import Setting
@@ -198,12 +198,9 @@ class SettingLoggingTest(GenericAPIView):
             mock_settings = MockSettings()
             for k, v in serializer.validated_data.items():
                 setattr(mock_settings, k, v)
-            mock_settings.LOG_AGGREGATOR_LEVEL = 'DEBUG'
+            AWXProxyHandler().perform_test(custom_settings=mock_settings)
             if mock_settings.LOG_AGGREGATOR_PROTOCOL.upper() == 'UDP':
-                UDPHandler.perform_test(mock_settings)
                 return Response(status=status.HTTP_201_CREATED)
-            else:
-                BaseHTTPSHandler.perform_test(mock_settings)
         except LoggingConnectivityException as e:
             return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
         return Response(status=status.HTTP_200_OK)