Default to a standalone server instead of a PDC

The setup wizard currently offers configuration as a Windows NT style
Primary Domain Controller (PDC) by default, if no existing PDCs are
present on the network.
Default to a standalone server instead, and add a note stating that
Windows NT style domain controller functionality will be phased out;
(bnc#870669).
3.1.5

Add SUSE Samba Team to the MAINTAINER file.