Reduce noise in the log of the HWDB processing script for submissions with udev data

The property BaseDevice.raw_bus is used to determine if a udev/HAL node rrpresents a real, physical device or if it defines only an "aspect" of a physical device. It is also used to determine if the submitted data contains enough details, like a vendor and product ID, for the given kind of device so that we can store it in our database.

In submissions with udev data we have a number of raw_bus values not used in HAL for nodes that either represent physical devices for which we don't have enough data or that represent only "apsects" or real devices. This leads to lots of warnings in the processing log.