MAPREDUCE-7334. TestJobEndNotifier fails. (#2877)

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestJobEndNotifier.java

@@ -80,7 +80,7 @@ public class TestJobEndNotifier {
       calledTimes++;
       try {
         // Sleep for a long time
-        Thread.sleep(1000000);
+        Thread.sleep(3000);
       } catch (InterruptedException e) {
         timedOut = true;
       }