Univention Corporate Server 4.1 erratum 267 (bugfix)

This update addresses the following issue(s):
* The package dependency to the master and backup server role packages has
  been removed.
* The sync mode can now be configured through Univention Configuration
  Registry variables for users, groups and containers separately.
* The ignored subtrees can now be configured through the Univention
  Configuration Registry variables connector/ad/mapping/ignoresubtree/*.
* Moving an object to a non-readable LDAP position resulted to a wrong
  move. This issue has been fixed.