chore(config): remove addons/packages entries (#4052)

We don't really use these two entries and people sometimes ask about them. Better to not have them as defaults.

#3901

Author: filipesilva

packages/angular-cli/blueprints/ng2/files/angular-cli.json

@@ -28,8 +28,6 @@
       }
     }
   ],
-  "addons": [],
-  "packages": [],
   "e2e": {
     "protractor": {
       "config": "./protractor.conf.js"