[Openstack-stable-maint] Stable check of openstack/tooz for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/aba72b37e49b412a81ca8fd188d096... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/80f19e30728e4e74ac545d8a4eafe7f4 : SUCCESS in 5m 09s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/35818c02fd714286ba0afd8bcae7713d : SUCCESS in 5m 37s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d46790b5e1b44e0c9e71d87bf9e394bf : SUCCESS in 5m 41s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/84d5b88aef3243db8ccb77e8951b4d22 : FAILURE in 4m 45s