Don't hardcode the test device's Bt address in the unit test.

Ensure that all signals emitted during a pairing request
are queued via the event loop. The exact reason for doing
this is unknown however such a change was done on purpose
in QtMobility. We keep the behavior to be on the safe side.

Change-Id: I666c5b2c25a0c80df634f7b6643bd08126812b65
Reviewed-by: Michael Zanetti <michael.zanetti@canonical.com>
Reviewed-by: Alex <alexander.blasche@digia.com>