[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/463cd74de63d452eb9292feb91b2f83f : SUCCESS in 4m 38s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b467a12390674dd6b523ec08640fba6c : FAILURE in 4m 13s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/881c700505e2447ab30b609189b481f1 : FAILURE in 5m 48s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4ee10031ccba4857a04f7ba9e9542c94 : FAILURE in 6m 34s