HDFS-16755. TestQJMWithFaults.testUnresolvableHostName() can fail due to unexpected host resolution (#4833)

Use ".invalid" domain from IETF RFC 2606 to ensure that the host doesn't resolve.

Contributed by Steve Vaughan Jr

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/qjournal/client/TestQJMWithFaults.java

@@ -198,7 +198,7 @@ public class TestQJMWithFaults {
   public void testUnresolvableHostName() throws Exception {
     expectedException.expect(UnknownHostException.class);
     new QuorumJournalManager(conf,
-        new URI("qjournal://" + "bogus:12345" + "/" + JID), FAKE_NSINFO);
+        new URI("qjournal://" + "bogus.invalid:12345" + "/" + JID), FAKE_NSINFO);
   }
 
   /**