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

Build failed. https://zuul.opendev.org/t/openstack/buildset/a1693c3f8ab44defb9c408801a7ccc... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/c6c07494b25a4296bf37863cf63ce57e : RETRY_LIMIT in 2s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/f82e2b3741964da590495d7ef4580a5f : SUCCESS in 3m 26s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7727c09efbf44e548ff5e6523688e53a : RETRY_LIMIT in 1s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0d987222ef554c16ba81bd227a595fbd : SUCCESS in 3m 28s