[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/92f214a87cbd48528d9cac8f56e7e574 : SUCCESS in 7m 58s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/9999e8b57e9a464ab763218483af6665 : FAILURE in 7m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d3d3fc57045246a4a1592075081fa78f : FAILURE in 9m 08s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/150aa91828794441a6cc180fab8cdfed : FAILURE in 9m 09s