Do not challenge inside spnego authenticator is FORKED_FLOW #27803
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Closes #20637
The spengo authenticator skips sending the challenge when the FORKED_FLOW is detected in the session. There are other ways of avoiding the challenge (for example using some flag only for spnego) but as I saw that FORKED_FLOW is only used by
reset-credentialsflow, so I think it's OK. Just let me know if you think it's better doing something more specific. Adding a little test to see the reser credentials works with no kerberos re-authentication.