add secret_file parameter to Windows

[kreeuwijk]

Pull Request (PR) description

adds the secret_file parameter to Windows

This Pull Request (PR) fixes the following issues

the secret_file parameter was missing for the Windows case in params.pp which was causing a catalog compilation failure with the following error:

Error while evaluating a Resource Statement, Class[Splunk::Forwarder]: parameter 'secret_file' expects a Stdlib::Absolutepath = Variant[Stdlib::Windowspath = Pattern[/^(([a-zA-Z]:[\\\/])|([\\\/][\\\/][^\\\/]+[\\\/][^\\\/]+)|([\\\/][\\\/]\?[\\\/][^\\\/]+))/], Stdlib::Unixpath = Pattern[/^\/([^\/\0]+\/*)*$/]] value, got Undef

[kreeuwijk]

The Debian tests on Travis are failing, it seems those tests aren't fully updated for the seed_password update. It has nothing to do with this PR.

[ody]

I am going to go ahead and merge this, I've validated that the PR has nothing to do with the failing tests. Different platform combinations failed on re-run of the build and I've only been able to get them to pass locally so I'll handle figuring out the tests that seem to have come from one of my previous PRs