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

Build failed. https://zuul.opendev.org/t/openstack/buildset/1fd5ebeb525844ca8ac1d420d575be... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5acb73e161cf475a8cc360f6a0771e24 : SUCCESS in 5m 55s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/5a78cbf2c7344f9e958d53534865acd0 : RETRY_LIMIT in 3m 06s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/7690db08da9849cb9216a72bd5c1fba7 : SUCCESS in 5m 29s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/8dfa0b481a6c4fa9a5c16d0475e7d462 : SUCCESS in 4m 38s