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

Build failed. https://zuul.opendev.org/t/openstack/buildset/29da957afb404517b77ba9406964f1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a715e87f3a074794a8e55243f5cecc9f : POST_FAILURE in 3m 33s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/095bf27058954adbb10f22cf052f7510 : SUCCESS in 2m 58s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/b5d657de060744d79fcf33169d1fa696 : SUCCESS in 3m 14s