Parametrize more options in config.$osfamily.erb templates

I found that DASHBOARD_PORT was missing in config.Debian.erb. So this request fixes this and also makes listen address, port and "start" options parametrizable.

 1. Add missing DASHBOARD_PORT to Debian config 
 2. Allow for configurable DASHBOARD_PORT
 3. Allow for configurable listen address
 4. Allow to choose if Dashboard may be started at boot time. Debian specific