test:replace common.fixturesDir with commonfixtures

PR-URL: #15832 Reviewed-By: Ryan Graham <r.m.graham@gmail.com> Reviewed-By: Tobias Nießen <tniessen@tnie.de> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com> Ruben Bridgewater <ruben@bridgewater.de>

Author: feons

test/parallel/test-tls-net-connect-prefer-path.js

@@ -1,5 +1,6 @@
 'use strict';
 const common = require('../common');
+const fixtures = require('../common/fixtures');
 
 // This tests that both tls and net will ignore host and port if path is
 // provided.
@@ -28,8 +29,8 @@ function mkServer(lib, tcp, cb) {
  const args = [handler];
  if (lib === tls) {
  args.unshift({
- cert: fs.readFileSync(`${common.fixturesDir}/test_cert.pem`),
- key: fs.readFileSync(`${common.fixturesDir}/test_key.pem`)
+ cert: fixtures.readSync('test_cert.pem'),
+ key: fixtures.readSync('test_key.pem')
  });
  }
  const server = lib.createServer(...args);