smbtorture: extend rpc.lsa to lookup machine over forest-wide LookupNames

smbtorture: extend rpc.lsa to lookup machine over forest-wide LookupNames

Add a simple test to resolve DOMAIN\MACHINE$ via LSA LookupNames3
using LSA_LOOKUP_NAMES_UPLEVEL_TRUSTS_ONLY2 level. This level would pass
zero lookup flags to lookup_name().

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14091

Signed-off-by: Alexander Bokovoy <ab@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Alexander Bokovoy <ab@samba.org>
Autobuild-Date(master): Wed Aug 14 13:07:42 UTC 2019 on sn-devel-184

(cherry picked from commit 4d276a93fc624dc04d880f5b4157f272d3555be6)

Autobuild-User(v4-9-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-9-test): Fri Aug 16 14:18:35 UTC 2019 on sn-devel-144