HBASE-6677 Random ZooKeeper port in test can overrun max port

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1388125 13f79535-47bb-0310-9956-ffa450edef68

hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/MiniZooKeeperCluster.java

@@ -171,7 +171,7 @@ public class MiniZooKeeperCluster {
           LOG.debug("Failed binding ZK Server to client port: " +
               tentativePort);
           // This port is already in use, try to use another.
-          tentativePort++;
+          tentativePort = selectClientPort();
           continue;
         }
         break;