test: refactor test-cluster-net-listen

10.5 error Please use assert.strictEqual() instead of assert.equal()

PR-URL: https://github.com/nodejs/node/pull/10047
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-cluster-net-listen.js

@@ -7,7 +7,7 @@ var net = require('net');
 if (cluster.isMaster) {
   // ensure that the worker exits peacefully
   cluster.fork().on('exit', common.mustCall(function(statusCode) {
-    assert.equal(statusCode, 0);
+    assert.strictEqual(statusCode, 0);
   }));
 } else {
   // listen() without port should not trigger a libuv assert