Define the available ports, so we can enable further protocols when needed.
Define a dedicated "restricted" IP, for use only for Nasqueron servers,
currently the public IP. In a follow-up change, when Drake network is ready,
we'll update that IP to 172.27.27.6.
Upstream image now uses /var/lib/rabbitmq instead of /data.
Nginx uses default config, but like Openfire, we proxy to the dedicated IP.