heimdal make kvno unisgned internally

heimdal make kvno unisgned internally

The folks at heimdal didn't like the patch in
commit 6379737b7ddc6ccb752238c5820cc62e76a8da17 and insisted
that kvno should remain unsigned internally, even though it is
encoded as signed in packets. This patch reverts some of the
unsigned->signed changes in that commit, and resolves conversion
issues - in order to be aligned with upstream Heimdal.

Signed-off-by: Uri Simchoni <uri@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue May 24 03:00:39 CEST 2016 on sn-devel-144