Add DisablePAFXFAST option to kafka exporter

[swythan]

Component(s)

exporter/kafka

Is your feature request related to a problem? Please describe.

When attempting to use kerberos authentication against ActiveDirectotry in the kafka exporter, I get the following error:

[Root cause: KRBMessage_Handling_Error] KRBMessage_Handling_Error: AS Exchange Error: AS_REP is not valid or client password/keytab incorrect < KRBMessage_Handling_Error: KDC did not respond appropriately to FAST negotiation

I'm told that this is because our ActiveDirectory controller doesn't support FAST.

Describe the solution you'd like

Looking further it seems that the sarama library added an option for this, so hopefully it should just be a question of plumbing the config through.

Sarama PR: IBM/sarama#1466
Sarama config docs: https://pkg.go.dev/github.com/IBM/sarama#GSSAPIConfig.DisablePAFXFAST

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• exporter/kafka: @pavolloffay @MovieStoreGuy

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[swythan]

This seems trivial to add, so I've speculatively made a PR.