MINOR: Remove sanitize filename for reads

[robschn]

Fixes #118

[mjuraga]

Hi, Rob, thanks for the PR, I have to look a bit trough history to find out why we were sanitizing filenames like this, but something in the back of my mind thinks because we use those filenames in the Runtime API, and on the URLs as resources names, so we needed them to match in all of these cases as identifiers. Removing file name sanitization completely, makes me a bit uncomfortable and in expectance of regressions popping up. Maybe we could change the function itself to include + if this is a big blocker for you.

[robschn]

@mjuraga Appreciate you taking a look! The biggest thing we're running into is loading both RSA and ECDSA files. The HAProxy docs recommend a file structure like cert.pem.rsa and cert.pem.ecdsa and using something like:

crt foobar.pem

This loads both files, but following that naming guideline results in the #118 we're seeing