Remove missing packages from Fedora-ELN-Guest.
    
    This commit removes few packages from Fedora-ELN-Guest kickstart:
    
    - insights-client - this is RHEL only package which does not exist
      in Fedora and therefore will not be installed in Fedora ELN.
    - rng-tools - this is not available in Fedora-ELN compose yet. We
      will enable rngd again once this is added to Fedora ELN.
    - dracut-norescue - this is RHEL only package. The Fedora equivalent
      of this is to remove dracut-config-rescue. This yes is also used
      in other Fedora kickstarts.
    
    Signed-off-by: Jan Kaluza <jkaluza@redhat.com>