fixed 'dont-sign' check to correctly recognize delegation NS records
fixed 'dont-sign' check to correctly recognize delegation NS records


threatstack/libldns,NLnetLabs/ldns,NLnetLabs/ldns,benlaurie/ldns,threatstack/libldns,gegenschall/ldns,threatstack/libldns,benlaurie/ldns,NLnetLabs/ldns,threatstack/libldns,gegenschall/ldns,threatstack/libldns,gegenschall/ldns,benlaurie/ldns,gegenschall/ldns,benlaurie/ldns,NLnetLabs/ldns