[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/ecafe178c7ad47b0bf1aa2ca48f7b710 : SUCCESS in 8m 40s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/8c3a11762d284183886479d137835b89 : FAILURE in 8m 32s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/67babd96866f45c6b0c74d95f3ddfd90 : FAILURE in 9m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/afb5c457cdfc4c8b963a695cb435a48c : FAILURE in 7m 50s