Allow Custom Certificates

[kchason]

With the bump of the Requests library in 3.1.0rc1, self-signed certificates or those issued by custom certificate authorities triggers an error like:

10/29/2021 03:54:03 PM:WARNING:Got ConnectionError [HTTPSConnectionPool(host='redacted', port=443): Max retries exceeded with url: /rest/api/2/serverInfo (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1129)')))] errno:None on GET https://redacted/rest/api/2/serverInfo

This branch adds a new option for providing the certificate authority that signed the server SSL certificate.

Closes #1159

[kchason]

I can't add a label which is failing the associated GitHub Action job but it should be bug

[adehad]

@kchason I prefer not adding additional arguments, especially as we are currently handling the argument incorrectly anyway. So I am partial to #1202, I believe it should also work for your case.

[studioj]

thanks for bringin this to light though @kchason ...
please review #1202 lets see if that would also work