ee site delete example.com delete mysql user

``` bash
define('DB_NAME', 'example.com');
define('DB_USER', 'root');
define('DB_PASSWORD', 'mytemppass');
define('DB_HOST', 'localhost');
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');
```

`ee site delete example.com` delete mysql root user 
