Fix header of GetConfigReply

Fix 311

Author: renanrodrigo

pyof/v0x04/controller2switch/get_config_reply.py

@@ -23,4 +23,4 @@ def __init__(self, xid=None, flags=None, miss_send_len=None):
                 datapath should send to the controller.
         """
         super().__init__(xid, flags, miss_send_len)
-        self.header.message_type = Type.OFPT_SET_CONFIG
+        self.header.message_type = Type.OFPT_GET_CONFIG_REPLY