core: Extract code to find DLNA.ORG_AnyContainer
core: Extract code to find DLNA.ORG_AnyContainer

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