title: node: dns.resolve can not get correct ip after calling dns.setServers
body: <p>I'm writing a program to resolve ip address with specific dns server, but it seems that <code>.setServers</code> method is not working...</p>
  <pre class="lang-js prettyprint-override"><code>const dns = require('dns');
  dns.setServers(['208.67.222.222', '208.67.220.220']);
  console.log(dns.getServers());
  dns.resolve('littlee.github.io', (err, res) =&gt; {
    console.log(err, res);
  });
  </code></pre>
  <p>terminal logs:</p>
  <pre><code>[ '208.67.222.222', '208.67.220.220' ]
  null [ '127.0.0.1' ]
  </code></pre>
  <p>the expected result should be: <code>185.199.108.153</code></p>