Redis Backend: Increases default socket timeout from 5 to 120 (Issue #3363)

celery/app/defaults.py

@@ -155,7 +155,7 @@ NAMESPACES = Namespace(
         max_connections=Option(type='int'),
         password=Option(type='string'),
         port=Option(type='int'),
-        socket_timeout=Option(5.0, type='float'),
+        socket_timeout=Option(120.0, type='float'),
     ),
     result=Namespace(
         __old__=old_ns('celery_result'),