[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/d9b33ccb263640c5a15d651e7edaa54c : SUCCESS in 5m 11s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/90bce2ae8aed408e9ab9bb03edb025e7 : FAILURE in 3m 54s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/22a869790e61401d9c59df13ee48c08e : FAILURE in 4m 32s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d1e3177452974fce904fe41643d673b3 : FAILURE in 5m 08s