fix registry addr error for mq-rpc

util/net/net.go

@@ -14,12 +14,13 @@ func HostPort(addr string, port interface{}) string {
 	if strings.Count(addr, ":") > 0 {
 		host = fmt.Sprintf("[%s]", addr)
 	}
-	// TODO check for NATS case
-	if v, ok := port.(string); ok {
-		if v == "" {
-			return fmt.Sprintf("%s", host)
-		}
+	// when port is blank or 0, host is a queue name
+	if v, ok := port.(string); ok && v == "" {
+		return host
+	} else if v, ok := port.(int); ok && v == 0 && net.ParseIP(host) == nil {
+		return host
 	}
+
 	return fmt.Sprintf("%s:%v", host, port)
 }