This fixes the following error when Jinja tries to process
`mpm_prefork.conf.jinja` or `00-mpm.conf.jinja`, when it processes the
`max_request_workers` comparison:

```
Unable to manage file: Jinja error: '>=' not supported between instances of 'str' and 'int'
[...]
<IfModule mpm_prefork_module>
  StartServers {{ mpm_param['start_servers'] | d('5') }}
  MaxRequestWorkers {{ mpm_param['max_request_workers'] | d('150') }}
{%- if mpm_param['max_request_workers'] | d('150') >= 256 %}    <======================
  ServerLimit {{ mpm_param['max_request_workers'] | d('150') }}
{%- endif %}
  MinSpareServers {{ mpm_param['min_spare_servers'] | d('5') }}
  MaxSpareServers {{ mpm_param['max_spare_servers'] | d('10') }}
  MaxConnectionsPerChild {{ mpm_param['max_connections_per_child'] | d('0') }}
```

Add filters that convert the values to an int first.

If MaxRequestWorkers is greater than 256 than you also need to set the
ServerLimit value which is defaulted to 256 but has a 20000 hard maximum

- Added more modules and configuration options
 - Renamed sls files to reflect what they do.
 - added mpm options for Debian