'Add roles to a user on a domain.'

def create_user_role_on_domain(self, domain_id, user_id, role_id):

    (resp, body) = self.put(('domains/%s/users/%s/roles/%s' % (domain_id, user_id, role_id)), None)
    self.expected_success(204, resp.status)
    return rest_client.ResponseBody(resp, body)
