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

Build failed. https://zuul.opendev.org/t/openstack/buildset/0270514dfe074f3497b7f1202e7925... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/5152274f250d42af91ef0cdfe2ea670f : SUCCESS in 4m 37s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/7a08633629de42ea9f2fbf92502acce2 : SUCCESS in 4m 47s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/34cae00c88f0451a8e9b428143cbd98d : SUCCESS in 5m 04s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1e9cd8caf1354e9fbc39d8afb4278fd6 : FAILURE in 4m 15s