mysql actions fail for lack of password/access

I get failures on the mysql stage and trying out the sls directly I found out that I was getting commands refused by mysql because no password was provided. 

Adding 

```
mysql.default_file: '/etc/mysql/debian.cnf'
```

to django-db's  /etc/salt/minion got it working. Should this be in the documentation or in the formula ? Is it a bug in the mysql formula ? 
