Univention Corporate Server 3.2 erratum 30 (bugfix)

This update fixes several issues:
* The new Univention Directory Listener module well-known-sid-name-mapping.py 
  implements a mechanism for domain wide customisation of account names for
  well known Windows/Samba SIDs. It sets the UCR variables "groups/default/.*"
  and "users/default/.*" in case accounts with well known sids are renamed.
* univention-pam now checks the mapping of user and group names 
  in the config registry templates.
* The default limit for "max open files" (nofile) in 
  /etc/security/limits.conf has been increased to "32768".
  This value can be changed by setting the ucr variables
  "security/limits/default/user/soft/nofile" and
  "security/limits/default/user/hard/nofile".