test: replaced fixturesDir with common.fixtures

PR-URL: https://github.com/nodejs/node/pull/15971
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-https-host-headers.js

@@ -1,15 +1,16 @@
 'use strict';
 const common = require('../common');
+const fixtures = require('../common/fixtures');
+
 if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const assert = require('assert');
 const https = require('https');
-const fs = require('fs');
 
 const options = {
-  key: fs.readFileSync(`${common.fixturesDir}/keys/agent1-key.pem`),
-  cert: fs.readFileSync(`${common.fixturesDir}/keys/agent1-cert.pem`)
+  key: fixtures.readKey('agent1-key.pem'),
+  cert: fixtures.readKey('agent1-cert.pem')
 };
 const httpsServer = https.createServer(options, reqHandler);