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

Build failed. https://zuul.opendev.org/t/openstack/buildset/5f8bdc25d217423ba1bf4e92825c2f... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/0d67c4baa25d49e5b198bc29638b199f : FAILURE in 4m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/61aaba9c8bfa4890857852d3b7353fc0 : FAILURE in 3m 22s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f8ee5e0883bb409ca940c4c5888ed874 : FAILURE in 4m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1daae0a876a841f1b590be5d3e4929a4 : FAILURE in 4m 49s