PLT-2899 adding clustering of app servers (#3682)

* PLT-2899 adding clustering of app servers

* PLT-2899 base framework

* PLT-2899 HA backend

* PLT-2899 Fixing config file

* PLT-2899 adding config syncing

* PLT-2899 set System console to readonly when clustering enabled.

* PLT-2899 Fixing publish API

* PLT-2899 fixing strings

webapp/utils/async_client.jsx

@@ -453,7 +453,8 @@ export function getConfig(success, error) {
 
             AppDispatcher.handleServerAction({
                 type: ActionTypes.RECEIVED_CONFIG,
-                config: data
+                config: data,
+                clusterId: Client.clusterId
             });
 
             if (success) {