[master] update LastLeaderChangeTime for hashicorp raft (#6292)

weed/server/master_server.go

@@ -191,7 +191,6 @@ func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
 	} else if raftServer.RaftHashicorp != nil {
 		ms.Topo.HashicorpRaft = raftServer.RaftHashicorp
 		raftServerName = ms.Topo.HashicorpRaft.String()
-		// TODO fix this for hashicorp raft
 		ms.Topo.LastLeaderChangeTime = time.Now()
 	}
 	ms.Topo.RaftServerAccessLock.Unlock()

weed/server/raft_hashicorp.go

@@ -78,6 +78,7 @@ func (s *RaftServer) monitorLeaderLoop(updatePeers bool) {
 			}
 			glog.V(0).Infof("is leader %+v change event: %+v => %+v", isLeader, prevLeader, leader)
 			prevLeader = leader
+			s.topo.LastLeaderChangeTime = time.Now()
 		}
 	}
 }