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

Build failed. https://zuul.opendev.org/t/openstack/buildset/c3b7160f8a9846c99acc3d2b64ed22...

- openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b372a4bcbd1e47df94b41b632abe86ae : SUCCESS in 3m 32s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/926412581b47452dbe51e65e049b8758 : FAILURE in 3m 24s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/f5f00e88c81c4afe9cbed77512acbd32 : SUCCESS in 3m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/fd0ffff778ed453d9472ee07a6899994 : SUCCESS in 3m 26s