Re-use existing description
Re-use existing description

No need to always build the description from template. This will allow
us to keep some modification to the description limited to first time
user runs rygel.

luisbg/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,jku/rygel,GNOME/rygel,GNOME/rygel,Tarnyko/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched