[krbdev.mit.edu #3322]

[Tom Yu via RT]

krb5_get_cred_via_tkt() explicitly checks that the requested server
principal name is identical to the returned server principal name.  This
prevents the cross-realm KDC referral logic in get_cred_from_kdc() from
working.  There should be a way to relax this check, perhaps
substituting a check that the cleartext and encrypted server principal
names are identical.