[krbdev.mit.edu #6335] test failures in password changing

[Ken Raeburn via RT]

The current trunk code fails a couple of the dejagnu tests.  Both have  
to do with changing passwords; one directly, one via kinit when the  
database entry is flagged to require a password change.  The logged  
error is that a network address was incorrect.

 From a bit of experimentation and observation, it appears that the  
problem comes up on machines with multiple non-loopback addresses  
(e.g., IPv4 + IPv6), and not on machines with only one address.

Ken