move some volume lookup operations to grpc

jwt related lookup will come in next commit

weed/command/backup.go

@@ -72,7 +72,7 @@ func runBackup(cmd *Command, args []string) bool {
 	vid := needle.VolumeId(*s.volumeId)
 
 	// find volume location, replication, ttl info
-	lookup, err := operation.Lookup(func() string { return *s.master }, vid.String())
+	lookup, err := operation.LookupVolumeId(func() string { return *s.master }, grpcDialOption, vid.String())
 	if err != nil {
 		fmt.Printf("Error looking up volume %d: %v\n", vid, err)
 		return true