Native Windows Kerberos authentication via Win32's SSPI API.

[manuco]

Hello,

Would you be interested in a PR allowing Windows Kafka-Python clients to connect to a GSSAPI enabled Kafka cluster, using the Windows Kerberos authentication ?

I've written a POC that does this : uses my Active Directory identity stored in my Windows session (and accessed via the Microsoft SSPI API) to access a Kafka cluster that use a GSSAPI authentication.

It involves :

• an optional dependency on pywin32, to access the SSPI API
• a new class that abstract the GSSAPI negotiation to switch between SSPI and GSSAPI based on what is found

I would be OK to push these changes, but I want to be sure that there is some interest for it.