[Review] Request from 'aduffeck' @ 'SUSE/machinery/autoyast_export'

Please review the following changes:
  * f99e4e5 Adapat autoyast export integration test
  * 90a3907 Use "http://" as the default entry for the system description URL
  * 69467f6 Be more thorough when importing config_files and changed_managed_files
  * 6964350 Add unmanaged files filter to AutoYaST export
  * 9c6d15c Copy system description content into the autoyast export directory
  * 9bd64f5 Add SystemDescription#description_path convenience method
  * 9ad7ca1 Add unmanaged_files to the autoyast export
  * 0d8b5de Create a more realistic unmnanaged_files directory in the factory
  * 1611478 Also add changed managed files to the autoyast export
  * e6ee5c5 Inject extracted config files during the autoyast installation