[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/1f5acf3167ea4102b89aaac7111b4924 : SUCCESS in 6m 33s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d48f2aafa31243b8b65351c8e8bf9ced : FAILURE in 5m 20s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9e7fb1e0389f47f98adf4d66f4f07ffa : FAILURE in 6m 31s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f08681353a6a4336a19eebb5f779a420 : FAILURE in 7m 09s