Univention Corporate Server 3.2 erratum 72 (bugfix)

This update fixes the following issues:
* In some cases the file ownership was not preserved correctly when a file is committed.
* The program "univention-check-templates" now also checks UCR template files
  for modifications by using the MD5 hash sum managed by dpkg.
* If the LDAP server is not available the tool univention-ldapsearch now tries to reconnect to
  the LDAP server. The count can be configured via the UCR variable ldap/client/retry/count. the
  value is set by default to 10.