Improve config-show to show hidden servers
    
    config-show only used to show enabled servers. Now also show hidden
    servers on separate lines. Additionally include information about
    KRA and DNS servers.
    
    The augmented config-show output makes it easier to diagnose a cluster
    and simplifies sanity checks.
    
    Fixes: https://pagure.io/freeipa/issue/7892
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>
    Reviewed-By: Thomas Woerner <twoerner@redhat.com>