test: refactor test-cluster-setup-master-argv

Change assert.equal to assert.strictEqual.

PR-URL: https://github.com/nodejs/node/pull/9993
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-cluster-setup-master-argv.js

@@ -8,7 +8,7 @@ setTimeout(common.fail.bind(assert, 'setup not emitted'), 1000).unref();
 cluster.on('setup', function() {
   var clusterArgs = cluster.settings.args;
   var realArgs = process.argv;
-  assert.equal(clusterArgs[clusterArgs.length - 1],
+  assert.strictEqual(clusterArgs[clusterArgs.length - 1],
                      realArgs[realArgs.length - 1]);
 });