https: support rejectUnauthorized for unix sockets

This commit allows self signed certificates to work with
unix sockets by forwarding the rejectUnauthorized option.

Fixes: https://github.com/nodejs/node/issues/13470
PR-URL: https://github.com/nodejs/node/pull/13505
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

test/parallel/test-https-unix-socket-self-signed.js

@@ -0,0 +1,28 @@
+'use strict';
+const common = require('../common');
+
+if (!common.hasCrypto) {
+  common.skip('missing crypto');
+  return;
+}
+
+common.refreshTmpDir();
+
+const fs = require('fs');
+const https = require('https');
+const options = {
+  cert: fs.readFileSync(common.fixturesDir + '/test_cert.pem'),
+  key: fs.readFileSync(common.fixturesDir + '/test_key.pem')
+};
+
+const server = https.createServer(options, common.mustCall((req, res) => {
+  res.end('bye\n');
+  server.close();
+}));
+
+server.listen(common.PIPE, common.mustCall(() => {
+  https.get({
+    socketPath: common.PIPE,
+    rejectUnauthorized: false
+  });
+}));