YARN-4393. Fix intermittent test failure for TestResourceLocalizationService#testFailedDirsResourceRelease (Varun Saxana via rohithsharmaks)

(cherry picked from commit 791c1639ae0b351e0bf0b2ecec854dc72ab07935)

Conflicts:

	hadoop-yarn-project/CHANGES.txt

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/TestResourceLocalizationService.java

@@ -2632,6 +2632,8 @@ public class TestResourceLocalizationService {
           new ApplicationLocalizationEvent(
             LocalizationEventType.DESTROY_APPLICATION_RESOURCES, app);
       spyService.handle(destroyApp);
+      // Waits for APPLICATION_RESOURCES_CLEANEDUP event to be handled.
+      dispatcher.await();
       verify(applicationBus).handle(argThat(matchesAppDestroy));
 
       // verify we got the right delete calls