[Review] Request from 'schubi2' @ 'yast/yast-autoinstallation/review_140825_second_stage'

Please review the following changes:
  * 0bd3a7a packaging
  * 034a32a making second_stage public in order to switch off completely
  * 7063df8 imaging: check for script entry only

As far I see image_location and image_name will be given via parameter to script defined in script_location. The downloading of the image has currently been disabled in autoyast. I do not really know why. At lease the download will be done in the script file. And the script file can (e.G. fix path) define this value by his own or taken the given argument. So image_location and image_name is optional.