[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/f9feabfc3e77440988f2ef28e9526324 : SUCCESS in 6m 13s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dd6ba6b17b044e8a9048b59762bc0d55 : FAILURE in 6m 19s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/cc3a0531a1774e6eab280ddea15d5ab9 : FAILURE in 6m 54s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/38516d6b4a174c21ae55375474a49cfa : FAILURE in 7m 18s