s4:selftest: also run rpc.winreg with kerberos and all possible auth options

s4:selftest: also run rpc.winreg with kerberos and all possible auth options

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11061

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Stefan Metzmacher <metze@samba.org>
Autobuild-Date(master): Tue Jun 23 17:31:08 CEST 2015 on sn-devel-104

(cherry picked from commit 6dd117b21ef06da68af67051f2822f71193d193a)

Autobuild-User(v4-1-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-1-test): Sun Jul 12 00:09:40 CEST 2015 on sn-devel-104