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

Change assert.equal to assert.strictEqual.

PR-URL: nodejs#9993
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: Christine Hong

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

@@ -8,8 +8,8 @@ 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],
-               realArgs[realArgs.length - 1]);
+  assert.strictEqual(clusterArgs[clusterArgs.length - 1],
+                     realArgs[realArgs.length - 1]);
 });
 
 assert.notStrictEqual(process.argv[process.argv.length - 1], 'OMG,OMG');