pfSense

Dy.fi is a small dynamic service provider exclusive to Finland (i.e., the service requires that the client IP locates to Finland).

The provider can be implemented with a simple custom rule:

```
url: http://www.dy.fi/nic/update?hostname=your-hostname.dy.fi
result_match: nochg|good IP
max_cache_age: 6
```

However, it's easier if one can select the correct one from the dropdown. Additionally, error messages are converted to human readable strings.

The new provider is implemented here: https://github.com/pfsense/pfsense/pull/4514