- Fixed JeOS image descriptions
  Added a function suseRemoveYaST which removes the yast packages
  if they are not needed by e.g autoyast or firstboot service.
  Replaced the unconditional remove of yast packages in all
  JeOS config.sh scripts by the new function
- Added __checkYaSTenvironment() runtime check
  With this check kiwi searches the given package list for entries
  starting with 'yast2' in order to make sure the user has at least
  added one yast client module if either the use of autoyast or the
  yast2 firstboot service was requested as part of the image
  description. It has turned out that people using autoyast in
  kiwi often forget to add the required YaST client packages. This
  check cannot make sure that the autoyast profile works correctly,
  it also does not know which client packages are required but it
  at least gives a hint if no yast stack is installed