Univention Corporate Server 4.1 erratum 14 (bugfix)

This update addresses the following issues:
* The free disc space requirement in the updater's "preup" script has been
  increased to 1.5GiB.
* The AWS EC2 image "Univention Corporate Server (UCS) 4.1 (official
  image) rev. 0" uses the repository server
  "updates-test.software-univention.de" instead of
  "updates.software-univention.de".
  This update resets the UCR variable repository/online/server on EC2
  images to "updates.software-univention.de".
* The layout in the UMC software update module has been adjusted to be
  responsive.