YARN-11509. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/amrmproxy/FederationInterceptor.java

@@ -1281,7 +1281,6 @@ private List<SubClusterId> registerAndAllocateWithNewSubClusters(
 
         // LaunchUAM And RegisterApplicationMaster
         try {
-
           TokenAndRegisterResponse result =
               ((FederationActionRetry<TokenAndRegisterResponse>) (retryCount) ->
               launchUAMAndRegisterApplicationMaster(config, subClusterId, applicationId)).

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/amrmproxy/TokenAndRegisterResponse.java

@@ -22,6 +22,9 @@
 import org.apache.hadoop.yarn.api.protocolrecords.RegisterApplicationMasterResponse;
 import org.apache.hadoop.yarn.security.AMRMTokenIdentifier;
 
+/**
+ * This class contains information about the AMRM token and the RegisterApplicationMasterResponse.
+ */
 public class TokenAndRegisterResponse {
   private Token<AMRMTokenIdentifier> token;
   private RegisterApplicationMasterResponse response;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/amrmproxy/TestFederationInterceptor.java

@@ -1474,7 +1474,7 @@ public void testLaunchUAMAndRegisterApplicationMasterRetry() throws Exception {
       FinishApplicationMasterResponse finishResponse =
           interceptor.finishApplicationMaster(finishReq);
       Assert.assertNotNull(finishResponse);
-      Assert.assertEquals(true, finishResponse.getIsUnregistered());
+      Assert.assertTrue(finishResponse.getIsUnregistered());
 
       return null;
     });