[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/ddb1d7e29b664321a143c282c83b3604 : SUCCESS in 7m 26s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bd4fa793698c41a8a674cba0ab23f65d : FAILURE in 6m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/fe4f08d8f673417f8d6afd0d4df7f2e6 : FAILURE in 7m 07s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/48d2adeab88f4f708c4e92ed7205348e : FAILURE in 7m 30s