feature request: advertise (proxy) jail hostnames

[ec1oud]

It seems to be problematic to run mdnsd both in the host and in a jail: the jail instance takes over and the host is no longer accessible by its .local name. That makes sense because the IP stack is shared between host and jails. But mdnsctl proxy can only advertise services, not hosts. I would like to have a similar feature to advertise the jail hostname/IP address mappings, so that one instance is enough. Avahi for example does it if you have multiple hosts listed in /etc/avahi/hosts.