center publish notify; fix topic partial match.

lichao

2021-05-20 68c7bef33e74f23aa0136ccd6f7faa654d671ebc

 src/exported_symbols

@@ -5,6 +5,7 @@
   BHUnregister;
   BHRegisterTopics;
   BHQueryTopicAddress;
   BHQueryProcs;
   BHSubscribeTopics;
   BHStartWorker;
   BHHeartbeatEasy;