net: wrap connect in nextTick

Fixes an edge case regression introduced in
1bef717.

With the lookup being skipped, an error could be emitted before an
error listener has been added.

An example of this was presented by changing the server’s IP address
and then immediately making a request to the old address.

Related: nodejs#1823
PR-URL: nodejs#2054
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-by: Trevor Norris <trev.norris@gmail.com>

lib/net.js

@@ -925,7 +925,9 @@ function lookupAndConnect(self, options) {
   // TODO(evanlucas) should we hot path this for localhost?
   var addressType = exports.isIP(host);
   if (addressType) {
-    connect(self, host, port, addressType, localAddress, localPort);
+    process.nextTick(function() {
+      connect(self, host, port, addressType, localAddress, localPort);
+    });
     return;
   }