[Openstack-stable-maint] Stable check of openstack/oslotest for ref refs/heads/stable/train failed

Build failed. https://zuul.opendev.org/t/openstack/buildset/8e72308706bb42668574a45314a430... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5c7abe3941c34c8ba8f544ee4385c2ed : FAILURE in 2m 10s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/a653c5fb5bfc42bfa4bd8fcb10755f1b : FAILURE in 3m 00s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5773a6fcd81c49dfa3f8594f0c5ea59a : FAILURE in 3m 04s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/96199b2ac17e4b90b83d431ecb070846 : FAILURE in 2m 40s