[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/9d643d278a5e4a0aa1b9c58f3f1b0f13 : SUCCESS in 6m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/fb66059ebe37406db97b6fa2bfb824dc : FAILURE in 8m 11s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b154d5c61ae44d76a7c5c6ba8f269a4a : FAILURE in 7m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a8269a2f0a924639a6efdfcd4d494735 : FAILURE in 7m 13s