Step details formatted for logging output.

def for_display(self):
        """ Step details formatted for logging output. """
        skip = ""
        if self.skip:
            skip = " [SKIP]"
        result = "{step_num}: {path}{skip}".format(
            step_num=self.step_num, path=self.path, skip=skip
        )
        description = self.task_config.get("description")
        if description:
            result += ": {}".format(description)
        return result