[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/b6a6f65b0f3147a183c90829864e4cb2 : SUCCESS in 5m 59s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d3ebbfc982ef49debaa42eb1dc7aa6b1 : FAILURE in 5m 23s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0b34fb820f644475b626cf49ca6d5e54 : FAILURE in 6m 37s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ce6d9e9d60e342f981779a00a3300be6 : FAILURE in 6m 45s