DO NOT MERGE Add additional options and receiver to BT tests

Add address and iterations options to bluetooth pair stress test.  Refactored
BroadcastReceiver into two receivers with one specific to pairing.  The pairing
receiver checks that we are pairing with the correct device, and also will
accept the pairing dialogue/enter a predefined password automatically.

Change-Id: I9c5283f8e9747e8b0129b7400a6b1345e78e46eb