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

Build failed. https://zuul.opendev.org/t/openstack/buildset/9569b8e0a53344ec91ebe2fa53f51d... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/e051c22d71644a2fbda10d1fd995af36 : RETRY_LIMIT in 2s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/dc26103fbcae41748fab00214ae3c427 : SUCCESS in 3m 42s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/e2f49c2217e448ccbaa49dc3830d61f5 : RETRY_LIMIT in 1s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/629109561fb946828f5ef22b295715b8 : RETRY_LIMIT in 2s