def get_settable_quotas(self, context, project_id, user_id=None):

        return self._driver.get_settable_quotas(context, self._resources,
                                                project_id,
                                                user_id=user_id)
Given a list of resources, retrieve the range of settable quotas for
dataset/ETHPy150Open openstack/nova/nova/quota.py/QuotaEngine.get_settable_quotas