[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/9f59c82409a5449d9691e6bd16138964 : SUCCESS in 5m 21s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/e0acf5e370f54536892c41035f8a17e7 : FAILURE in 4m 35s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/59ec200d4d0f4b5caf29746ce8363c9f : FAILURE in 8m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8be5092ca4f242b39047a379922b40d0 : FAILURE in 6m 11s