code: func (c *cmd) destroyData() error {
  	kv := c.apiclient.KV()
  	dir := path.Join(c.conf.prefix, c.sessionID)
  	_, err := kv.DeleteTree(dir, nil)
  	return err
  }
docs: // destroyData is used to nuke all the data associated with
  // this remote exec. We just do a recursive delete of our
  // data directory.