The previous fix was incomplete. But it also finally uncovered an
old check-des problem that I'd had once and which may have gotten
papered over by changing the default of one of the *strongest* KDC
parameters. The old problem is that we were passing the wrong
enctype to _kdc_encode_reply(): we were passing the session key
enctype where the ticket enc-part key's enctype was expected.
The whole enctype being passed in is superfluous anyways. Let's
clean that up next.