[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/6462c32c585840d4a9cca17a412bf8... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/de013a9de0e74099acae00b226474ea3 : SUCCESS in 4m 42s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/bf4abed14ba744298550ec70e7451d3f : SUCCESS in 4m 44s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/fdb4925e11d245e98bfcdce6439f2a0e : SUCCESS in 3m 57s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5783a031c75049ccac266c046d77be20 : FAILURE in 4m 25s