[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/a03e773281644515a5a51d02909f66db : SUCCESS in 5m 12s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5c5f711bca334d268db16943de0e6e44 : FAILURE in 3m 36s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a6c11b558aa143098384c9b0a2f620d5 : FAILURE in 4m 20s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e41b8f87aaf54329bf5b79d5805df767 : FAILURE in 4m 58s