Comment 8 for bug 2028744

My colleague Matt Anson spotted this: https://review.opendev.org/c/openstack/bifrost/+/902233. We have proposed a cherry-pick to 2023.1. That config section was made conditional in: https://github.com/openstack/bifrost/commit/8d273d13147bcdffdfa3e803ff46e15b18662b0b. This broke discovery.