public static RequestStatusResponse deleteServices(AmbariManagementController controller, Set<ServiceRequest> requests)
      throws AmbariException, AuthorizationException, NoSuchFieldException, IllegalAccessException {
    ServiceResourceProvider provider = getServiceProvider(controller);
    return provider.deleteServices(requests);
  }
Allows to set maintenanceStateHelper. For use when there is anything to test
with maintenance mode.
ambari-server/src/test/java/org/apache/ambari/server/controller/internal/ServiceResourceProviderTest.java