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

Build failed. https://zuul.opendev.org/t/openstack/buildset/2546af206e9c47729206f89d6c2215... - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/da981bccf5de449da37c2b2e6e853f19 : SUCCESS in 3m 52s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/b4c001e3133e4fcf9bce192e2f61cda9 : SUCCESS in 7m 43s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/6507cfc7c90a4852b4a2b1efe932de52 : SUCCESS in 4m 26s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/299eb1daf0fe4892937d36ea5c41287a : FAILURE in 3m 35s