HDFS-10270. TestJMXGet:testNameNode() fails. Contributed by Gergely Novák

(cherry picked from commit d2f3bbc29046435904ad9418073795439c71b441)

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/tools/TestJMXGet.java

@@ -123,9 +123,6 @@ public class TestJMXGet {
         jmx.getValue("NumLiveDataNodes")));
     assertGauge("CorruptBlocks", Long.parseLong(jmx.getValue("CorruptBlocks")),
                 getMetrics("FSNamesystem"));
-    DFSTestUtil.waitForMetric(jmx, "NumOpenConnections", numDatanodes);
-    assertEquals(numDatanodes, Integer.parseInt(
-        jmx.getValue("NumOpenConnections")));
 
     cluster.shutdown();
     MBeanServerConnection mbsc = ManagementFactory.getPlatformMBeanServer();