remove testing hashlib

hashlib is in stdlib from python 2.5, no more need for testing its
existence.

builder/kojid

@@ -74,7 +74,6 @@ try:
     import pykickstart.parser as ksparser
     import pykickstart.handlers.control as kscontrol
     import pykickstart.errors as kserrors
-    import hashlib
     import iso9660 # from pycdio
     image_enabled = True
 except ImportError:  # pragma: no cover