YARN-9594. Fix missing break statement in ContainerScheduler#handle. Contributed by lujie.

(cherry picked from commit 6d80b9bc3ff3ba8073e3faf64551b9109d2aa2ad)

 Conflicts:
	hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.java

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/scheduler/ContainerScheduler.java

@@ -199,6 +199,7 @@ public class ContainerScheduler extends AbstractService implements
       break;
     case RECOVERY_COMPLETED:
       startPendingContainers(maxOppQueueLength <= 0);
+      break;
     default:
       LOG.error("Unknown event arrived at ContainerScheduler: "
           + event.toString());