Generate symlinks based on the pungi_compose_id pointing to ODCS composes.
    
    This commit adds code to generate symlinks for raw_configs in the following
    format:
    
      - $conf.target_dir/$compose.compose_type/$compose.pungi_compose_id
      - $conf.target_dir/$compose.compose_type/latest-$name-version
    
    The goal is to make it easier for end-user to consume raw_config
    composes in the future and to find out the latest successfull
    raw_config compose.
    
    Signed-off-by: Jan Kaluza <jkaluza@redhat.com>