Config items are converted to lowercase on Windows

[twangboy]

We are using vmware tools plugin to install salt-minion. I tried sending the following parameters as part of guestinfo for salt_minion.args:

fips_mode=True
signing_algorithm=PKCS1v15-SHA224
encryption_algorithm=OAEP-SHA224

But, unfortunately, the _parse_config method in svtminion.ps1 is converting all argument values to LowerCase. And salt-minion is then not starting up with the signing algorithm set as pkcs1v15-sha224.