cluster_mgr does not listen the brpc_raft_port

*Issue migrated from trac ticket # 804*

**component:** cluster manager | **priority:** minor

#### 2022-06-08 11:16:48: zhangjindong@zettadb.com created the issue


___
> The cluster_mgr starts normally, but it does not listen the brpc_raft_port, and the std.log is empty. The process list is normal, and the sys log does not show any error releated message.