code: def validate_save_dir(self):
          
          # checking if working directory exists
          print 'Working dir: {} '.format(self.workdir)
          if not os.path.isdir(self.workdir):
              print 'Creating working directory {}'.format(self.workdir)
              os.mkdir(self.workdir)
          # actual target directory for VM
          target_directory = os.path.join(self.workdir, self.vm_obj.config.instanceUuid)
          print 'Target dir: {}'.format(target_directory)
          if not os.path.isdir(target_directory):
              print 'Creating target dir {}'.format(target_directory)
              os.mkdir(target_directory)
          return target_directory
docs: Validate that the save directory exists, if not, create it
          :return: str directory