- kernel-ppc64 -> kernel-default
  * Starting with openSUSE 12.3, powerpc doesn't have special
    kernel flavor anymore.
- Enable ppc64le architecture
  * Enable powerpc64le architecture, which is almost the same
    as powerpc64 but little endian
- Simplify and cleanup the command executor module KIWIQX
  * There is no code creating instances of KIWIQX, thus we
    only need class methods and should call as such
  * If called within the package context the exit status will
    stay but can still be evaluated as part of the package.
    That way we can keep the backtrace feature and can better
    check if enough resources to call the command existed