test: update to const and strictEqual

Update `var` to `const` and `assert.equal` to `assert.strictEqual`

Author: ghvaldez

test/parallel/test-cluster-shared-handle-bind-privileged-port.js

@@ -1,8 +1,8 @@
 'use strict';
-var common = require('../common');
-var assert = require('assert');
-var cluster = require('cluster');
-var net = require('net');
+const common = require('../common');
+const assert = require('assert');
+const cluster = require('cluster');
+const net = require('net');
 
 if (common.isWindows) {
   common.skip('not reliable on Windows');
@@ -18,13 +18,13 @@ if (cluster.isMaster) {
   // Master opens and binds the socket and shares it with the worker.
   cluster.schedulingPolicy = cluster.SCHED_NONE;
   cluster.fork().on('exit', common.mustCall(function(exitCode) {
-    assert.equal(exitCode, 0);
+    assert.strictEqual(exitCode, 0);
   }));
 } else {
-  var s = net.createServer(common.fail);
+  const s = net.createServer(common.fail);
   s.listen(42, common.fail.bind(null, 'listen should have failed'));
   s.on('error', common.mustCall(function(err) {
-    assert.equal(err.code, 'EACCES');
+    assert.strictEqual(err.code, 'EACCES');
     process.disconnect();
   }));
 }