[Messenger] Added Lazy option to redis

Author: Nyholm

messenger.rst

@@ -1165,6 +1165,8 @@ delete_after_ack     If ``true``, messages are deleted      false
                      automatically after processing them
 delete_after_reject  If ``true``, messages are deleted      true
                      automatically if they are rejected
+lazy                 Connect only when we first need the    false
+                     connection
 serializer           How to serialize the final payload     ``Redis::SERIALIZER_PHP``
                      in Redis (the
                      ``Redis::OPT_SERIALIZER`` option)