dnsmasq: allow peer=libvirtd to support named profile
The /usr/sbin/libvirtd profile will get a profile name ("libvirtd").
This patch adjusts the dnsmasq profile to support the named profile in addition to the "old" path-based profile name.
I propose this patch for 2.12..master.
It won't apply on 2.10 and 2.11 cleanly, and the risk that someone uses the latest libvirtd in combination with these old versions isn't too big. Nevertheless, if something thinks I should backport to 2.10 and 2.11, please speak up. It won't be terribly hard ;-)