[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/0d00f428b8b24d6cab848344c3044453 : SUCCESS in 5m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/aae039af04464512bf01c7a6d28edcb3 : FAILURE in 4m 01s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5e51ef5cafd54aad86d850b7a22bf80d : FAILURE in 6m 17s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5e2043d1250b42afabad50789574acd2 : FAILURE in 5m 35s