QtIFW

adding ConsumeOutputOperation

 - With that operation we can save the original qmake output,
   before the installer does the patching. So we can use the old values
   for modules patching if they will be installed later.
 - added a autotest which does that with the current used qmake

Change-Id: Ie07d273bf64d1813b7af3374a0db35a9e1215503
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>