add msg tag; recv all msgs before remove mq.

lichao

2021-04-23 628c1c21ffb19d8c96ed9ce89531595f9870ab1a

 src/bh_api.cpp

@@ -10,6 +10,7 @@
{
TopicNode &ProcNode()
{
   static bool init_bind_msg_shm = MsgI::BindShm(BHomeShm());
   static TopicNode node(BHomeShm());
   return node;
}