change docker restart policy

kolla-ansible deploy raiser error:
TASK [common : Starting heka container] ****************************************
fatal: [10.20.11.3]: FAILED! => {"changed": true, "failed": true, "msg": "'Traceback (most recent call last):\\n File \"/tmp/ansible_UhYuWB/ansible_module_kolla_docker.py\", line 742, in main\\n result = bool(getattr(dw, module.params.get(\\'action\\'))())\\n File \"/tmp/ansible_UhYuWB/ansible_module_kolla_docker.py\", line 567, in start_container\\n self.create_container()\\n File \"/tmp/ansible_UhYuWB/ansible_module_kolla_docker.py\", line 555, in create_container\\n self.dc.create_container(**options)\\n File \"/usr/lib/python2.7/site-packages/docker/api/container.py\", line 120, in create_container\\n return self.create_container_from_config(config, name)\\n File \"/usr/lib/python2.7/site-packages/docker/api/container.py\", line 131, in create_container_from_config\\n return self._result(res, True)\\n File \"/usr/lib/python2.7/site-packages/docker/client.py\", line 178, in _result\\n self._raise_for_status(response)\\n File \"/usr/lib/python2.7/site-packages/docker/client.py\", line 174, in _raise_for_status\\n raise errors.APIError(e, response, explanation=explanation)\\nAPIError: 500 Server Error: Internal Server Error (\"{\"message\":\"maximum retry count cannot be used with restart policy \\'unless-stopped\\'\"}\")\\n'"}
        to retry, use: --limit @/home/kolla_install/kolla/ansible/site.retry

so we need to chang kolla restart policy of 'unless-stopped'