QtIFW

Remove stupid check. Return the proper core status.

Also take into account the current status, break if it is
already Canceled or Failure. Fix fetch remote packages, as
it would set always Success, even if we already canceled.

Change-Id: I3562d485c762c6df6ff230029bc678475afd5b2c
Reviewed-on: http://codereview.qt.nokia.com/3502
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>