Remove sys in new tests

test/disabled/pipe-test.js

@@ -2,7 +2,6 @@ var common = require('../common');
 var assert = require('assert');
 var http = require('http');
 var net = require('net');
-var sys = require('sys');
 
 var webPort = common.PORT
 var tcpPort = webPort + 1;

test/simple/test-http-buffer-sanity.js

@@ -1,7 +1,7 @@
 var common = require('../common');
 var assert = require('assert');
 var http = require('http');
-var sys = require('sys');
+var util = require('util');
 
 var bufferSize = 5 * 1024 * 1024;
 var measuredSize = 0;