[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/84911ed66c85475fa70e85d0ae3c7511 : SUCCESS in 7m 19s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/eb389298e5d84ff2ab1cd6f3978d3364 : FAILURE in 6m 17s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c31516960a6a43ea85701d8e5395b15f : FAILURE in 7m 44s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/f47e571d66894be78af7450608892999 : FAILURE in 8m 40s