krb5_auth: update with correct UPN if needed

The Active Directory KDC handles request case in-sensitive and it might
not always to possible to guess the UPN with the correct case. We check
if the returned principal has a different case then the one used in the
request and updates the principal if needed. This will help using calls
from the Kerberos client libraries later on which would otherwise fail
because the principal is handled case sensitive by those libraries.

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