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-http-upgrade-client.js

@@ -53,7 +53,7 @@ srv.listen(common.PORT, '127.0.0.1', function() {
     var expectedHeaders = {'hello': 'world',
                             'connection': 'upgrade',
                             'upgrade': 'websocket' };
-    assert.deepEqual(expectedHeaders, res.headers);
+    assert.deepStrictEqual(expectedHeaders, res.headers);
 
     socket.end();
     srv.close();