[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/47e9408b10404d9ab66a59796be5ab85 : SUCCESS in 6m 46s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/3af499162c9b44188650fda4672e18b5 : FAILURE in 5m 38s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6576e457b56b46ff90c1c406d7f34817 : FAILURE in 6m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2ea849f8c047426fbc399a3bd5eb5eb0 : FAILURE in 5m 53s