test: use assert.strictEqual() cluster test

Updated test-cluster-shared-handle-bind-privileged-port test
method to use assert.strictEqual() instead of assert.equal()

PR-URL: nodejs#10042
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>

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

@@ -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);
   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();
   }));
 }