[krbdev.mit.edu #8925] [Comment] qualify_shortname default can be harmful in LAN setups

[Greg Hudson via RT]

https://krbdev.mit.edu/rt/Ticket/Display.html?id=8925
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In the previous comment, I meant to say S4U2Proxy, not S4U2Self. This wrinkle
cannot be ironed out, because krb5_get_credentials() can only see the evidence
ticket, not the client name within, so it cannot check the cache.