ipaserver/install/dns: handle SERVFAIL when checking reverse zone
    
    systemd-resolved in Fedora 34+ returns SERVFAIL for reverse zone that
    does not yet exist when we attempt to look it up before installation.
    Assume that this is OK -- we are going to create the zone ourselves
    during installation.
    
    Fixes: https://pagure.io/freeipa/issue/8794
    
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>