[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/b5d3190999bc4bdb9c5c016c6a472feb : SUCCESS in 6m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/517adfe2cd0740768def6c48efd60875 : FAILURE in 5m 09s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/4b19ea2aa8624518b19cc4ee8bafd167 : FAILURE in 5m 47s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/75611c493c5f495cbc60406aa7c1a604 : FAILURE in 6m 16s