[Review] Request from 'schubi2' @ 'yast/yast-autoinstallation/review_140722_bootloader_package_selection_order'

Please review the following changes:
  * e00a846 packaging
  * 112402b calling bootloader before the package selection
  * 814bccb add needed system packages (E.g. for the bootmanager) to the solver

This is suspicious. How did it work before? `computed_packages` is only used to *remove* the kernel so I assume the real work of *adding* is/was a side effect of `Packages.ComputeSystemPackageList`.