report multiple zonefile errors, don't stop after first violation (#85)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: https://dev.hostsharing.net/hostsharing/hs.hsadmin.ng/pulls/85
Reviewed-by: Marc Sandlus <marc.sandlus@hostsharing.net>

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsDomainDnsSetupHostingAssetValidator.java

@@ -97,6 +97,7 @@ public class HsDomainDnsSetupHostingAssetValidator extends HostingAssetEntityVal
 
     String toZonefileString(final HsHostingAsset assetEntity) {
         // TODO.spec: we need to expand the templates (auto-...) in the same way as in Saltstack, with proper IP-numbers etc.
+        // TODO.impl: auto-AUTOCONFIG-RR auto-AUTODISCOVER-RR missing
         return """
                 $TTL {ttl}