Seed-Bifrost wrong configuration dnsmasq

[Sylvère K]

After running `kayobe seed service deploy` discovery of the overcloud inventory isn't possible.

Inspecting the bifrost_deploy container on the seed machine, it seems that dnsmasq.conf isn't properly generated and is missing this part : https://github.com/openstack/bifrost/blob/e41ed498324e527400b50897fbb8b51ac909db1e/playbooks/roles/bifrost-ironic-install/templates/dnsmasq.conf.j2#L96-L119

Current configuration : https://forge.univ-lyon1.fr/p1919734/kayobe-config

Kayobe version 14.2.0 and kayobe 14.2.1.dev21 share the same issue.

[Will Szumski (willjs)]

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.