YARN-11433. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-globalpolicygenerator/src/main/java/org/apache/hadoop/yarn/server/globalpolicygenerator/GlobalPolicyGenerator.java

@@ -298,6 +298,7 @@ public static void main(String[] argv) {
       if (argv.length > 1) {
         if (argv[0].equals("-format-policy-store")) {
           // TODO: YARN-11561. [Federation] GPG Supports Format PolicyStateStore.
+          System.err.println("format-policy-store is not yet supported.");
         } else {
           printUsage(System.err);
         }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/Router.java

@@ -252,8 +252,10 @@ public static void main(String[] argv) {
       if (argv.length > 1) {
         if (argv[0].equals("-format-state-store")) {
           // TODO: YARN-11548. [Federation] Router Supports Format FederationStateStore.
+          System.err.println("format-state-store is not yet supported.");
         } else if (argv[0].equals("-remove-application-from-state-store") && argv.length == 2) {
           // TODO: YARN-11547. [Federation] Router Supports Remove individual application records from FederationStateStore.
+          System.err.println("remove-application-from-state-store is not yet supported.");
         } else {
           printUsage(System.err);
         }