- moved the check for the Amazon EC2 toolkit after the check
  for the credentials. If no or not enough credentials are provided
  the bundling is skipped and that's not an error. Thus it's ok
  to miss ec2-bundle-image at that point so the check needs to be
  done after successfully checking for the pre-conditions
- fixed checkmedia call if used in hybrid disk mode.
  in this mode a disk partition device was passed instead
  of the entire disk device (bnc #804160)