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

Build failed. https://zuul.opendev.org/t/openstack/buildset/0135ed2090254d2091f751f98a2cca... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/97f2e3236afd4e76a89cdc5cd597adb5 : FAILURE in 4m 26s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/0ca658b7bc2247be978dcbef756b6e75 : FAILURE in 3m 08s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/0f7ed4f7549d420ca4fca6ee2c931d53 : FAILURE in 2m 55s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/83a718e833644bd7b3695c3594d778e9 : FAILURE in 4m 15s