Revert "Support UPN_DNS_INFO in the PAC"

This reverts commit a6be8a97f705247c1b1cbb0595887d8924740a71.

We fail (often) to parse a krb5pac type 12 buffer due to the incomplete change
which came in via a6be8a97f705247c1b1cbb0595887d8924740a71. This change came
into master and has only been released in RCs so no regression to published
4.0.x releases. We should revert this for 4.1 for now until we can make it work
in all cases (see work on this in
https://git.samba.org/?p=gd/samba/.git;a=shortlog;h=refs/heads/master-krb5pac_type12).
Without this revert the entire PAC parsing may fail which can effect serious
implications (krb5 smb session setup not working).

Bug: https://bugzilla.samba.org/show_bug.cgi?id=10178

Signed-off-by: Günther Deschner <gd@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Oct  3 17:08:46 CEST 2013 on sn-devel-104