[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/fdb995584c884702bee7e02819586858 : SUCCESS in 7m 16s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/d7495f10b9f24c0781b50fb4f71f6faf : FAILURE in 6m 12s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/bcabce738db9430aa20dffb3b803ab79 : FAILURE in 7m 51s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8f5688d0c1484a979494081db697c1a0 : FAILURE in 6m 45s