libads: record service ticket endtime for sealed ldap connections

libads: record service ticket endtime for sealed ldap connections

When a ticket is obtained for binding a signed/sealed ldap connection,
its liftime should be recorded in the ads struct, in order to enable
reuse of the connection.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11267

Signed-off-by: Uri Simchoni <urisimchoni@gmail.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <rb@sernet.de>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed May 13 04:32:16 CEST 2015 on sn-devel-104