disable http agent in http_forward - it has been capping us at five simul...

disable http agent in http_forward - it has been capping us at five simul forwarded requests per backend process (dbwriter, keysigner)

lib/http_forward.js

@@ -14,7 +14,8 @@ module.exports = function(dest, req, res, cb) {
     host: u.hostname,
     port: u.port,
     path: u.pathname,
-    method: req.method
+    method: req.method,
+    agent: false
   }, function(pres) {
     res.statusCode = pres.statusCode;
     // forward along Content-Type and Content-Length, if available