CVE-2022-37967 Add new PAC checksum

CVE-2022-37967 Add new PAC checksum

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15231

Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(similar to commit a50a2be622afaa7a280312ea12f5eb9c9a0c41da)
[jsutton@samba.org Fixed conflicts in krb5pac.idl and raw_testcase.py]

[jsutton@samba.org Fixed conflicts in kdc_base_test.py, raw_testcase.py,
 knownfails, tests.py. Adapted KDC PAC changes to older function.]

[jsutton@samba.org Fixed conflict in raw_testcase.py; adapted to older
 Heimdal version]