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

Build failed. https://zuul.opendev.org/t/openstack/buildset/50aeb92ec9d446c1991d4454791845... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/aca50dea92904b5685963f116d492371 : FAILURE in 5m 02s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/36136049d9c6468f90b9cf4d3ac24f1c : FAILURE in 2m 59s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/a9c81e25dfb344bc99aa15d143bb2c52 : FAILURE in 2m 38s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/a7e72cb16cee4ad598fb8be277b69266 : FAILURE in 2m 32s