Configure NetworkManager to use systemd-resolved
    
    zzz-ipa.conf now enables NetworkManager's systemd-resolved plugin when
    systemd-resolved is detected.
    
    See: https://pagure.io/freeipa/issue/8275
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>