[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/e7c978a77e724de886894cd94530ca20 : SUCCESS in 5m 27s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/862b9382601b4f96b11359ebe07534d3 : FAILURE in 4m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/9d61a17fb06e408a8226b9bb39c88346 : FAILURE in 5m 44s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d7afc7c33e2a4330b4dc661ad86ed68c : FAILURE in 6m 46s