test: hasCrypto https-server-keep-alive-timeout

Currently this test will fail with the following error message when
configured --without-ssl:
Error: Node.js is not compiled with openssl crypto support

This commit checks for crypto and skips this tests if such support
is not available.

PR-URL: #13253
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: danbev

test/parallel/test-https-server-keep-alive-timeout.js

@@ -1,6 +1,10 @@
 'use strict';
 
 const common = require('../common');
+if (!common.hasCrypto) {
+  common.skip('missing crypto');
+  return;
+}
 const assert = require('assert');
 const https = require('https');
 const tls = require('tls');