Utilize new QBluetoothSocket::OperationError on QNX and Bluez

Task-number: QTBUG-36817

Change-Id: I17f7d57537f7f1a5cedd01ce6043cfd6aac26db4
Reviewed-by: Nedim Hadzic <nedimhadzija@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>