[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/e4c4b5ec4551408d926fb35257f7f8... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dcdd2c8298404269a93def881cae6cd1 : SUCCESS in 5m 08s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/86d681b181f34b81ab1469ea13e36845 : SUCCESS in 5m 41s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/37cc71af96c54aa490aced129c57424a : SUCCESS in 5m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/762356d6fde149fc9d57bb394282424d : FAILURE in 4m 52s