@Override
    protected String getRequestData() {
        /**
         * {
         *   "ServiceInfo" : {
         *     "service_name" : serviceName
         *   }
         * }
         */
        JsonObject jsonServiceInfoObj;
        jsonServiceInfoObj = createJsonObject("ServiceInfo", createJsonObject("service_name", serviceName));
        Gson gson = new Gson();
        return gson.toJson(jsonServiceInfoObj);
    }
Constructs the request data.

@return - Request data.
ambari-funtest/src/test/java/org/apache/ambari/funtest/server/api/service/AddServiceWebRequest.java