code: public static JsonObject matchCommand(JsonObject commandsJson, String commandName, String storageService) {
          for (String key : commandsJson.keySet())  {
              if (key.equals(storageService)) {
                  JsonObject commandCats = commandsJson.getJsonObject(key);
                  if (commandCats.containsKey(commandName)) {
                      return commandCats.getJsonObject(commandName);
                  }                
              }
          }
          return null;
      }
docs: Finds out if a command is supported by Doradus
  @param commandsJson
  @param commandName
  @param storageService
  @return