[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/6f5d802fbb1d49b2b3b5113b31b106a0 : SUCCESS in 7m 40s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/67fb00a6a9d84211a3b862b79258f30a : FAILURE in 6m 06s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/676a7e07c4474a3ca4c891223488fc60 : FAILURE in 6m 11s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/cb5bdbf53d204904895a311439ffdee1 : FAILURE in 6m 30s