[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/e5b30b51d39241ff95c2e20a4c2b54e2 : SUCCESS in 5m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/04a32afd7e8c40b49e95336350534c04 : FAILURE in 4m 39s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/542d788f765c487f803cf1d1d5a02af9 : FAILURE in 4m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0958cf152cc348859ded8c0731340272 : FAILURE in 6m 25s