add api, Unregister, QueryTopicAddress.

lichao

2021-04-23 65a230ec6ccb61c3ce6816730da2106f07f40b4a

 proto/source/bhome_msg.proto

@@ -44,6 +44,8 @@
   // kMsgTypeSubscribeReply = 23;
   kMsgTypeUnsubscribe = 24;
   // kMsgTypeUnsubscribeReply = 25;
   kMsgTypeUnregister = 26;
   // kMsgTypeUnregisterReply = 27;

}