Ignore dnssec-enable-related named-checkonf errors in test
    
    Check and skip dnssec-enable-related issues in 9.18+ where dnssec-enable
    option was removed completely.
    
    Fixes: https://pagure.io/freeipa/issue/9157
    
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Francisco Trivino <ftrivino@redhat.com>
    Reviewed-By: Francisco Trivino <ftrivino@redhat.com>