Allow setting any logrotate option in logrotate.conf

This is the same logic as is used in logrotate::file to set any option directly in logrotate.conf

For example, Ubuntu is setting ```su root syslog``` in logrotate.conf

Example:
```
class { 'logrotate':
  options => [
    'su root syslog',
  ],
}

... logrotate::file ...
```