SUBMARINE-57. Add more elaborate message if submarine command is not recognized. Contributed by Adam Antal

(cherry picked from commit e5f4cd0fdae7e689789dd74bfbcfa6c52895f037)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-submarine/src/main/java/org/apache/hadoop/yarn/submarine/client/cli/Cli.java

@@ -97,7 +97,7 @@ public class Cli {
       }
     } else {
       printHelp();
-      throw new IllegalArgumentException("Bad parameters <TODO>");
+      throw new IllegalArgumentException("Unrecognized option: " + args[0]);
     }
   }
 }