Merge pull request #1625 from duhenglucky/ipv4_first

[ISSUE #1639] use ipv4 first when choosing local IP

common/src/main/java/org/apache/rocketmq/common/UtilAll.java

@@ -547,8 +547,6 @@ public class UtilAll {
                             if (ipV6Check(ipByte)) {
                                 if (!isInternalV6IP(ip)) {
                                     return ipByte;
-                                } else if (internalIP == null) {
-                                    internalIP = ipByte;
                                 }
                             }
                         }