[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/c87177a7f682441b9f8b5dd81313485b : SUCCESS in 8m 18s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dc18e8a56ab24a9ea814ec0620b323b1 : FAILURE in 5m 46s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6bdfe9af5559466fafed92924196c2d2 : FAILURE in 6m 33s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/6cd64b17ed9e464d8ef4935a5634a1b1 : FAILURE in 8m 32s