s3:selftest: add smbclient_ntlm tests

s3:selftest: add smbclient_ntlm tests

We test all combinations of NT1 with and without spnego and SMB3
for user, anonymous and guest authentication.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11849

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Günther Deschner <gd@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Thu Apr 28 20:16:45 CEST 2016 on sn-devel-144

(similar to commit eee88e07b3e68efb467b390536eea4155b5ced7e)