remove reference to the opensuse heroes from the ssh banner. reasons:
    
    - there are machines that are managed by openSUSE heroes AND another
      team.
    - there are machines that are not even managed by opensuse heroes at
      all, but from eg another team or from SUSE-IT
    - We don't have that data yet in salt, so it is also hard to project it
      at the ssh_banner. So better not to show anything than to show
      incomplete data