Univention Corporate Server 4.1 erratum 108 (bugfix)

This update addresses the following issues:
* The join scripts are now executed in a working chroot-environment to allow
  the installation of a DC Master using the profile based installation.
* The repository path and versions in the template file for profile based
  installations were updated for UCS-4.1.
* The name of the menu entry for booting from the local hard disk was changed
  to 'local' to prevent a name collision.
* The package description has been extended to simplify finding the package
  when searching for "Preboot Execution Environment" (PXE).
* The daemon used to wait for successful installations has been changed to
  listen on all network interfaces by default.