add request topic cache; refactor req/rep center.

lichao

2021-04-02 dc12826dd61ce18fac3a9561c5843d30a0cf9660

 src/center.cpp

@@ -23,7 +23,6 @@

SharedMemory &BHomeShm()
{
   static SharedMemory shm("bhome_default_shm_v0", 1024*1024*64);
   static SharedMemory shm("bhome_default_shm_v0", 1024 * 1024 * 64);
   return shm;
}