schema: Some 2012 objects were missing systemflags

schema: Some 2012 objects were missing systemflags

The adprep LDIF files were adding the systemFlags, but they weren't
present in the 2012 schema files. This is not just a Microsoft
documentation problem - the difference was present when doing a provision
of a 2012 Windows server vs using Adprep.exe to upgrade an older Windows
server.

Samba might as well use the correct systemFlags right from the start.

Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>