Bluetooth: Enable basic interaction with LE scan

Adds new commands to shell app allowing turn on/off active LE scan.
App uses scan results callback to get feedback when found any
advertisers around.
The dummy app's callback prints out info about findings.

Change-Id: Ifffe77b804230c19bbbcbc4f38e47210c835106d
Signed-off-by: Arkadiusz Lichwa <arkadiusz.lichwa@tieto.com>
1 file changed