Return list of all sanitize files provided by the user on the command line.

        N.B.: We only support one sanitize file at the moment, but
              this is likely to change in the future

def get_sanitize_files(self):
        """
        Return list of all sanitize files provided by the user on the command line.

        N.B.: We only support one sanitize file at the moment, but
              this is likely to change in the future

        """
        if self.parent.config.option.sanitize_with is not None:
            return [self.parent.config.option.sanitize_with]
        else:
            return []