Univention Corporate Server 3.2 erratum 81 (security)

This updates fixes the following issues in the samba package:
* Versions in the package dependencies have been updated.
* Domain account lockout support for Samba AD DCs has been implemented.
* The domain services database module was affected by a segmentation fault
  when handling objects without object class.
* "samba-tool dbcheck" now also lists/handles name conflict objects and
  objects without object class.
* Randomise DCs in DFS referral replies, e.g. for the sysvol share
* Fix for CVE-2013-4496