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

Build failed. https://zuul.opendev.org/t/openstack/buildset/c25cf94ac55f481a87351dc341c91e... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/b3f058410bf54b7d92df8e94aa2fe37a : SUCCESS in 5m 21s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/5946d025f5ef490ea34e5a1ee5cc73b5 : SUCCESS in 4m 36s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d08d5f61665a4cdeadb5954e69b910e2 : POST_FAILURE in 4m 22s