[addon] blacklist moch bad tokens and return a indication response

addon/moch/mochHelper.js

@@ -1,7 +1,9 @@
+const BadTokenError = { code: 'BAD_TOKEN' }
+
 function chunkArray(arr, size) {
   return arr.length > size
       ? [arr.slice(0, size), ...chunkArray(arr.slice(size), size)]
       : [arr];
 }
 
-module.exports = { chunkArray }
+module.exports = { chunkArray, BadTokenError }