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

Build failed. https://zuul.opendev.org/t/openstack/buildset/1d25db64869442d98c2006ae89598c... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/ebe4acc4d52940f1b10da7434cbf96ee : FAILURE in 2m 34s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/2219ac809e604d69b96c9c17be7dccc6 : FAILURE in 2m 29s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/2255e873d61c46fa9d18a6cbacedd5ed : FAILURE in 2m 35s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/d6594c06193a4965ae05f626d9c58080 : FAILURE in 2m 18s