[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/3c7f6a8152cd4e568e52f4f86f211686 : SUCCESS in 6m 41s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2e2cfd707670421e9d6e0edf1d51dc33 : FAILURE in 5m 31s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/13ade30de0914626b0435df393a4b193 : FAILURE in 8m 50s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/7d23dc294ac443d292c70a3456ede773 : FAILURE in 7m 08s