'Add roles to a group on a domain.'

def create_group_role_on_domain(self, domain_id, group_id, role_id):

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