YARN-9915: Fix FindBug issue in QueueMetrics. Contributed by Prabhu Joseph.

(cherry picked from commit 83d148074f9299de02d5c896a3ed4e11292cba73)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/QueueMetrics.java

@@ -467,7 +467,7 @@ public class QueueMetrics implements MetricsSource {
       2; i < resources.length; i++) {
       ResourceInformation resource =
         resources[i];
-      customResources.put(resource.getName(), new Long(0));
+      customResources.put(resource.getName(), Long.valueOf(0));
     }
 
     registerCustomResources(customResources, ALLOCATED_RESOURCE_METRIC_PREFIX,