net: remove unnecessary process.nextTick()

Call internalConnect() directly when the target is an IP address.
No delay is necessary because it defers any callbacks it makes.

PR-URL: https://github.com/nodejs/node/pull/12342
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/net.js

@@ -991,10 +991,7 @@ function lookupAndConnect(self, options) {
   // If host is an IP, skip performing a lookup
   var addressType = cares.isIP(host);
   if (addressType) {
-    process.nextTick(function() {
-      if (self.connecting)
-        internalConnect(self, host, port, addressType, localAddress, localPort);
-    });
+    internalConnect(self, host, port, addressType, localAddress, localPort);
     return;
   }