Univention Corporate Server 4.2 erratum 106 (bugfix)

This update addresses the following issue(s):
* Adapt univention-app-appliance to changes in UCS 4.2 branding.
* Fix for hard to read status messages during boot
  because they were overlaid by the appliance logo.
* The welcome screen design has been improved and adapted to the
  UCS 4.2 design style. The fqdn has been removed from the screen.
* The package is now maintained.