code: func (c *ClientSet) Stop() {
  	c.Lock()
  	defer c.Unlock()
  
  	if c.consul != nil {
  		c.consul.transport.CloseIdleConnections()
  	}
  
  	if c.vault != nil {
  		c.vault.httpClient.Transport.(*http.Transport).CloseIdleConnections()
  	}
  }
docs: // Stop closes all idle connections for any attached clients.