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

Build failed. https://zuul.opendev.org/t/openstack/buildset/9ba480782ce140758a365925eb6af3... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/4d85b1abc943478ab10f9ed54f46a448 : FAILURE in 5m 40s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/6231f7ebfe764c7d81ca3fecf5a16243 : FAILURE in 3m 00s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/306c8b972c914094b41ec61e7b6e95e6 : FAILURE in 3m 08s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/98f936bb0e8c4685bde0641984da7356 : FAILURE in 4m 14s