Univention Corporate Server 3.2 erratum 276 (bugfix)

This update addresses the following issues:
* GPO Security Descriptors can now be synchronised between OpenLDAP and
  the Samba directory service.  By default this is not activated, an 
  upcoming errata update for UCS@school 4.0 will make use of this feature.
* Ignore cn=Subschema and warn if the listener didn't pass entryUUID