code: func (c *Adb) KillServer() error {
  	conn, err := c.server.Dial()
  	if err != nil {
  		return wrapClientError(err, c, "KillServer")
  	}
  	defer conn.Close()
  
  	if err = wire.SendMessageString(conn, "host:kill"); err != nil {
  		return wrapClientError(err, c, "KillServer")
  	}
  
  	return nil
  }
docs: /*
  KillServer tells the server to quit immediately.
  
  Corresponds to the command:
  	adb kill-server
  */