[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/9d395a4a77054b35b8ace632d552d638 : SUCCESS in 4m 50s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/fe206516fa8b43119da3b67c1d2996d5 : FAILURE in 4m 25s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b8dcdcddb06248e2916ac4529195a9c8 : FAILURE in 4m 59s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/e7f625772d654e09b33923b3871d92cd : FAILURE in 6m 09s