[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/2aaa4f2a3ad442a1a818b3d84060a118 : SUCCESS in 6m 24s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b8090385ea444d15877eec072ca7270a : FAILURE in 4m 34s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/cb6de98c3af248a0996e41808b380707 : FAILURE in 4m 24s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/4820fe03d86d4eb2a15b0ff2c51efef5 : FAILURE in 5m 11s