Returns an management service client

def management(self):
        """Returns an management service client"""

        endpoint = self._instance.get_endpoint_for_service_type(
            "management",
            region_name=self._instance._region_name,
        )

        token = self._instance.auth.get_token(self._instance.session)

        self._management = tuskar_client.get_client(
            2, os_auth_token=token, tuskar_url=endpoint)

        return self._management