[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/71d4edde7766425db4ff164e863b47cb : SUCCESS in 6m 57s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/95ba07bbf298440598e88e042bd695e5 : FAILURE in 10m 42s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6d83f1fb185c4233b340409e1a5ed1dd : FAILURE in 9m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1b40a83032b74db18e7d5e2a65cd9c49 : FAILURE in 8m 45s