UDN is supposted to be a constant
UDN is supposted to be a constant

Only generate the UDN if it's not already done and save it once it's
generated.

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