[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/832289f1d61d497f984b56d28e24ccb5 : SUCCESS in 7m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/62bd3807fe244fecad3e1ef8b222a9b6 : FAILURE in 7m 07s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/462e2be6c70149d9aeb41038cb60d1d8 : FAILURE in 7m 25s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/201d9f0972ff4a0f815292aefb84fcef : FAILURE in 8m 23s