QtQA: Mark scripts as insignificant in Ubuntu 12.04

These have always been failing in Ubuntu 12.04. Marking as
insignificant to be able to make the stage blocking.

Task-number: QTQAINFRA-708
Change-Id: I0625365fd92e1211bb4fd0cef5a4e49efa770c13
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>