Bluetooth - service discovery bugfix/test update on OS X

SDP inquiry either fails to start, or ends with an error. The failure at
start was not handled correctly (probably messing with failing tests as a result).
Print the original IOKit return code, set an error (thus emitting signal) +
also make a test case verbose to see these error codes.

Change-Id: Ica3cc5681b91f02a6b7f7e2681a653b5a9dbfd46
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>