[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/a88ac8aa669c4a118b9cad5a9c4cd5ae : SUCCESS in 7m 54s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5775cb75b6124eb59d4fe68e619f735e : FAILURE in 6m 52s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/214e934aafe1420b9800b3fda1b51188 : FAILURE in 8m 21s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/ceeccc3d089c4a3d9e6f727bff975d96 : FAILURE in 7m 59s