bugxfix: device will be added to registry even if it's descriptor URL is
not accessible

Signed-off-by: Andre Fuechsel <a.fuechsel@telekom.de>
renamed everything from UpnpXXX to UPnPXXX

Signed-off-by: Andre Fuechsel <a.fuechsel@telekom.de>
uses OSGi UPnPDevice. Mapping code copied from Cling, will be removed
later by forking Cling. 

Signed-off-by: Andre Fuechsel <a.fuechsel@telekom.de>