Don't use stringToVersion from pykickstart.
    
    First off, it's in the version module, not in the parser.  Second, it's
    not necessary since makeVersion will take either a string or a constant
    as an argument.
    
    Patch by Chris Lumens <clumens@redhat.com>
    
    Signed-off-by: Dennis Gilmore <dennis@ausil.us>