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

Build failed. https://zuul.opendev.org/t/openstack/buildset/5e637776e2944079a1513165c42ec1... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/a39da4b633c64105bf3cd0ec1a5b7fed : FAILURE in 2m 35s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/7ec9917bd599441fbf217f4ab9607765 : FAILURE in 2m 26s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/d4f5275a976c42fbbc78eb72e711153c : FAILURE in 2m 13s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/fe1fa7665c89436c8cf41af23496a773 : FAILURE in 4m 26s