Pass only needed params to create layergroup map config provider

lib/cartodb/controllers/map.js

@@ -319,16 +319,26 @@ function prepareAdapterMapConfig (mapConfigAdapter) {
 function createLayergroup (mapBackend, userLimitsApi, pgConnection, affectedTablesCache) {
     return function createLayergroupMiddleware (req, res, next) {
         const requestMapConfig = req.body;
-        const { context, user } = res.locals;
+
+        const { context } = res.locals;
+        const { user, cache_buster, api_key } = res.locals;
+        const { dbuser, dbname, dbpassword, dbhost, dbport } = res.locals;
+
+        const params = {
+            cache_buster, api_key,
+            dbuser, dbname, dbpassword, dbhost, dbport
+        };
+
         const datasource = context.datasource || Datasource.EmptyDatasource();
         const mapConfig = new MapConfig(requestMapConfig, datasource);
+
         const mapConfigProvider = new CreateLayergroupMapConfigProvider(
             mapConfig,
             user,
             userLimitsApi,
             pgConnection,
             affectedTablesCache,
-            res.locals
+            params
         );
 
         res.locals.mapConfig = mapConfig;