'GET role delegated by a trust.'

def show_trust_role(self, trust_id, role_id):

    (resp, body) = self.get(('OS-TRUST/trusts/%s/roles/%s' % (trust_id, role_id)))
    self.expected_success(200, resp.status)
    body = json.loads(body)
    return rest_client.ResponseBody(resp, body)
