[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/bb961419136c44e98c89c6cc07732f12 : SUCCESS in 5m 15s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/39455a8939e844c1b1e7af7f89777038 : FAILURE in 4m 24s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/31f0bd20263a46a4b1ee9c065823147b : FAILURE in 6m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0095af9098944b80a2399fdaadf627d6 : FAILURE in 5m 26s