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

Build failed. https://zuul.opendev.org/t/openstack/buildset/04d6831513274224b688940e26c188... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/d8a3a3dbdc844763a02f1a7bc85c9e06 : SUCCESS in 6m 06s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/aeef9eb53efd4c24ba8750258758c1e2 : SUCCESS in 4m 49s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/690c57c2bee745808b50533e23d72ec5 : SUCCESS in 6m 15s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/54488293609346f09332d1cce1171bf6 : FAILURE in 3m 54s