test,benchmark: use deepStrictEqual()

In preparation for a lint rule that will enforce
assert.deepStrictEqual() over assert.deepEqual(), change tests and
benchmarks accordingly. For tests and benchmarks that are testing or
benchmarking assert.deepEqual() itself, apply a comment to ignore the
upcoming rule.

PR-URL: https://github.com/nodejs/node/pull/6213
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/parallel/test-stream-push-strings.js

@@ -41,6 +41,6 @@ ms.on('readable', function() {
 var expect = [ 'first chunksecond to last chunk', 'last chunk' ];
 process.on('exit', function() {
   assert.equal(ms._chunks, -1);
-  assert.deepEqual(results, expect);
+  assert.deepStrictEqual(results, expect);
   console.log('ok');
 });