The idea is that all kinds of devices inherit from one abstract
base class and that they are all managed by one device manager,
who does not know about their specifics.
For now, the only concrete subclass is the LinuxDeviceConguration.

Change-Id: I31ff5586a0fdd6bcf8dcc0554bb2b91fe65b2f3f
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>