Add known fail for samba3.blackbox.smbclient_basic.NT1.smbclient
which fails against nt4_schannel (because it doesn't support
SMB1)
Additionally since we don't have plans to create a nt4_schannel_smb1
test env provide additional coverage by running this test against
nt4_dc_smb1 (which still support SMB1)
Signed-off-by: Noel Power <noel.power@suse.com> Reviewed-by: Ralph Boehme <slow@samba.org>