[refactor] Pass all options to Agent constructor

Author: mmalecki

Diff for: lib/node-http-proxy.js

@@ -352,12 +352,7 @@ exports._getAgent = function _getAgent (options) {
   var Agent = options.https ? https.Agent : http.Agent,
       agent;
 
-  agent = new Agent({ 
-    host: options.host, 
-    port: options.port
-  });
-
-  agent.maxSockets = options.maxSockets || maxSockets;
+  agent = new Agent(options);
 
   return agent;
 }
@@ -392,4 +387,4 @@ exports._getBase = function _getBase (options) {
   }
 
   return result;
-};
+};