[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/78037945da9540609030e5537c756974 : SUCCESS in 9m 16s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/54824bc2dfb24eb68d049f2ee77d5b7c : FAILURE in 6m 50s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d07ca1aa344f47238041086bf1093436 : FAILURE in 7m 27s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/95bafe1fca1c4cf2a90566e409f2160d : FAILURE in 8m 35s