refactor for addon/service/container consistency

addon - app manifest thing. part of app lifecycle
services - implementation of addon (may have containers assoc)

src/routes/mailserver.js

@@ -21,7 +21,7 @@ function proxy(req, res, next) {
     delete req.headers['authorization'];
     delete req.headers['cookies'];
 
-    addons.getServiceDetails('mail', 'CLOUDRON_MAIL_TOKEN', function (error, addonDetails) {
+    addons.getContainerDetails('mail', 'CLOUDRON_MAIL_TOKEN', function (error, addonDetails) {
         if (error) return next(BoxError.toHttpError(error));
 
         parsedUrl.query['access_token'] = addonDetails.token;