ALLJOYN-1850 Pass in concurrency from BusAttachment down to LocalEndpoint dispatcher.

Change-Id: I88e6d468419d4d3f3ea2b03550bb5a8b9ffcc23d
ALLJOYN-1697 Messages from Proximity scanner were too frequent

The proximity scanner had few debug statements that were output
to logcat in release mode. This caused too many debug statements
to be generated. The statements were originally added for the
test team to make it easier for them to spot certain aspects of
the scanner.