[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/6a335a072c8a4c84b65ab9f8fd40174e : SUCCESS in 7m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dddb420f85864b56ba85fe36e5bef78e : FAILURE in 6m 19s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d1894afb6af64c4ba3c3b7c5697981b7 : FAILURE in 8m 35s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/2d2a9ec56cdf4ac9a39b0a0a89371958 : FAILURE in 8m 38s