Bug#841372: Kerberos config update for CS.CMU.EDU

[Sam Hartman]

Jeff, I've just uploaded kerberos configs 2.6.
If you  delete /etc/krb5.conf and then install krb5-config 2.6 and
confirm that the entry there works for you, I'll fill out paperwork to
request an unblock for stretch.
(I don't think this will make it for the auto migration)