The service name is cleared in waitForMessage instead of receiveMessage
so that consequent packets can de delivered to the service. A flag is
used to check if the operation succeeded.

Change-Id: I45b94a6194026d22ffb75a394628c7497ce4704e
Reviewed-on: http://codereview.qt.nokia.com/3486


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>