[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 current get_creds.c fallback code, if the fallback happens (so that we
try the DNS-canonicalized server name) and we find the service ticket in the
cache, we store it back into the cache, creating a duplicate entry.