YARN-11350. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java

@@ -880,7 +880,7 @@ public int getDelegationTokenSeqNum() {
   /**
    * Set SeqNum from stateStore.
    *
-   * @return delegationTokenSequenceNumber.
+   * @param seqNum delegationTokenSequenceNumber.
    */
   public void setDelegationTokenSeqNum(int seqNum) {
     stateStore.setDelegationTokenSeqNum(seqNum);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestZookeeperFederationStateStore.java

@@ -51,7 +51,6 @@
 import static org.apache.hadoop.util.curator.ZKCuratorManager.getNodePath;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 
 /**