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

Build failed. https://zuul.opendev.org/t/openstack/buildset/87aff448a91145a5b423b973d4fa43... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/dcb13a0f24b948f49f156ad59539e9df : FAILURE in 3m 53s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/61c9c27029954f249b568ef468af1a81 : FAILURE in 3m 03s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/318f46e4d6894932a5ce14a3a55f4c62 : FAILURE in 3m 10s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/0ea51beeadeb41c2a10158375b46cef2 : FAILURE in 3m 02s