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

Build failed. https://zuul.opendev.org/t/openstack/buildset/d15f9d0d175949168e7b079b40c1f2... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dc7fe8ae29304562b4165aff95d9531f : RETRY_LIMIT in 1s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/009ac324682c4f5d80f32d48d42491a0 : RETRY_LIMIT in 2s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/baf6e0fdd16242d8823835723dc4a792 : RETRY_LIMIT in 2s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/5dbf56e4755a4529bb1936e2a05fc8d3 : RETRY_LIMIT in 1s