[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/b8b72ff26355487a99bbb7e8e6a77b67 : SUCCESS in 7m 36s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bc56a71ab905490ea22acd690f9acd13 : FAILURE in 6m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/3a9440071e85483c8df7a30226d40c5d : FAILURE in 8m 33s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d9d2577db3cb4894a7c8ba1e28c5ae15 : FAILURE in 8m 27s