[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/0783b437c0ca418e9ea1c8bb48234011 : SUCCESS in 7m 30s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/344ebb4c3dda4d7fbf25132d7e1e6901 : FAILURE in 5m 48s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/10b2f184d6e443d8823f3374dfa236b7 : FAILURE in 5m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/986c4f61c53b439bb6dc774ff169e14a : FAILURE in 7m 35s