etc/samba/smb-debian-edu.conf: Use TJENER instead of SKOLELINUX as workgroup
name to match the Samba server 'standalone' role; this way TJENER will be used
as domain name for freeRADIUS automatically. As an additional benefit the
wbinfo command is working to check users.

Move the 'ntlm auth' entry from share/debian-edu-config/smb.conf.edu-site
to etc/samba/smb-debian-edu.conf (and enable it) to avoid a possible
pitfall in case manual adjustment is forgotten.

Signed-off-by: Wolfgang Schweer <wschweer@arcor.de>