Univention Corporate Server 4.4 erratum 485 (bugfix)

This update addresses the following issues:
* Reinitializing an installed app led to an unnecessary image pull.
  This fix skips this pull to increase the reinitialization speed.
* Fixed an issue where installation of apps on remote UCS systems would not
  work when using wildcard SSL certificates.
* Minor fix that makes it easier to change the timeout between calls for the
  appcenter listener converter
* Fixed the logic to identify the main service container for multicontainer
  apps.