Revert "Enable TCP timeout by default"

Causing programs to not exit gracefully.

This reverts commit cb84cde4.

lib/net.js

@@ -5,7 +5,6 @@ var dns = require('dns');
 
 var kMinPoolSpace = 128;
 var kPoolSize = 40*1024;
-var kDefaultTimeout = 60*1000;
 
 var debugLevel = process.env['NODE_DEBUG'] ? 1 : 0;
 function debug () {
@@ -258,8 +257,6 @@ function _doFlush () {
 }
 
 function initStream (self) {
-  timeout.enroll(self, kDefaultTimeout);
-
   self._readWatcher = ioWatchers.alloc();
   self._readWatcher.callback = function () {
     // If this is the first recv (pool doesn't exist) or we've used up