YARN-9162. Fix TestRMAdminCLI#testHelp. Contributed by Ayush Saxena.

(cherry picked from commit 5db7c4906235dd1070b9706ca4971f1eb5d74139)
(cherry picked from commit a453f38015fec454f63e9f5459b0330ac3bc7eb3)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/RMAdminCLI.java

@@ -190,7 +190,8 @@ public class RMAdminCLI extends HAAdmin {
   private static void appendHAUsage(final StringBuilder usageBuilder) {
     for (Map.Entry<String,UsageInfo> cmdEntry : USAGE.entrySet()) {
       if (cmdEntry.getKey().equals("-help")
-          || cmdEntry.getKey().equals("-failover")) {
+          || cmdEntry.getKey().equals("-failover")
+          || cmdEntry.getKey().equals("-transitionToObserver")) {
         continue;
       }
       UsageInfo usageInfo = cmdEntry.getValue();
@@ -305,7 +306,8 @@ public class RMAdminCLI extends HAAdmin {
     }
     if (isHAEnabled) {
       for (String cmdKey : USAGE.keySet()) {
-        if (!cmdKey.equals("-help") && !cmdKey.equals("-failover")) {
+        if (!cmdKey.equals("-help") && !cmdKey.equals("-failover")
+            && !cmdKey.equals("-transitionToObserver")) {
           buildHelpMsg(cmdKey, helpBuilder);
           helpBuilder.append("\n");
         }