Application templates tests fixed

This one is related with that [PR](https://github.com/yiisoft/yii2/pull/3655). Things done:

- fixed common test - cases configs;
- removed unnecessary mocks; 
- `yii2-faker` extenstion is set up now for each application tier, so user dont need to bother with it or specify each time long options, since they are now specified in `_console.php` configs.