center restart with new shm; set center node ssn.

lichao

2021-06-02 993c556000a414011626770540678948f16eaa9e

 src/topic_node.cpp

@@ -50,8 +50,8 @@

} // namespace

TopicNode::TopicNode(SharedMemory &shm) :
    shm_(shm), state_(eStateUninited)
TopicNode::TopicNode(SharedMemory &shm, MQId ssn_id) :
    shm_(shm), state_(eStateUninited), ssn_id_(ssn_id)
{
}