[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/93b318faa6a848499c957ea59a14cba0 : SUCCESS in 4m 14s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dcee1cdd375f485ebb2a95a442b9c352 : FAILURE in 3m 20s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/b32dbd83441c49ae85b43176bc7768e0 : FAILURE in 4m 22s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/095e0da4e835401eb404b734a2e3477a : FAILURE in 5m 15s