fix bug:  two same volumeId in different collections 1, there will be two leader when master server startup in a few seconds 2, raft server will get a leader even there is only one master, so there is no need to do hard code to set the server to be leader
fix bug:  two same volumeId in different collections
1, there will be two leader when master server startup in a few seconds
2, raft server will get a leader even there is only one master, so there is no need to do hard code to set the server to be leader

chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs