[krbdev.mit.edu #5712] Random issue reported by Kevin

[Kevin Koch via RT]

I forgot to add that the real identity is the default identity in all 
cases.  Never is testprinc the default identity.

> You are getting an error with a ticket that is near expiration.
> Perhaps your VM clock and the server clock are off by a couple of
> minutes and the service ticket is being rejected.  In this case
> the ticket appears to be valid to the client according to its
> clock and is invalid on the server.
 
testprinc is expired.  Not near expiration, expired.

This is happening on the host PC, not in a VM.