[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/e4e8a78703744b57893481f487874b75 : SUCCESS in 7m 22s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5e04fe6f44bf4e8f81398669a7de3c3e : FAILURE in 7m 04s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/ecf99cb5adc54bf79060a4bc5469221c : FAILURE in 6m 23s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/23fc338786d04fca848415005fd1716c : FAILURE in 7m 50s