1. volume server now sends master server its max file key, so that

master server does not need to store the sequence on disk any more
2. fix raft server's failure to init cluster during bootstrapping

go/weed/master.go

@@ -72,11 +72,12 @@ func runMaster(cmd *Command, args []string) bool {
 
 	go func() {
 		time.Sleep(100 * time.Millisecond)
+		myAddress := *masterIp + ":" + strconv.Itoa(*mport)
 		var peers []string
 		if *masterPeers != "" {
 			peers = strings.Split(*masterPeers, ",")
 		}
-		raftServer := weed_server.NewRaftServer(r, peers, *masterIp+":"+strconv.Itoa(*mport), *metaFolder, ms.Topo, *mpulse)
+		raftServer := weed_server.NewRaftServer(r, peers, myAddress, *metaFolder, ms.Topo, *mpulse)
 		ms.SetRaftServer(raftServer)
 	}()