Comment 2 for bug 1517751

notification.Audit.update needed to be changed from service_id to ref['id'],
when u call create_service function with service_id and service_ref parameters,
because service_id may be not equal to ref['id'],
we should use ref['id'] instead of service_id
when calling 'notifications.Audit.updated'.Because the function of
test_create_service in test_notifications has implemted with service_ref['id'],
I do not need to change the test code.