DescriptionFile: Preserve order when adding elements
DescriptionFile: Preserve order when adding elements

UPnP Device Architecture 1.1 specifies the order of elements
in the device description. Preserve that order when dynamically
adding elements.

https://bugzilla.gnome.org/show_bug.cgi?id=702451

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