Don't allow an IP to be configured multiple times as a DNS server. Ticket #5915
Don't allow an IP to be configured multiple times as a DNS server. Ticket #5915

jxmx/pfsense,ch1c4um/pfsense,jxmx/pfsense,ptorsten/pfsense,NOYB/pfsense,dennypage/pfsense,dennypage/pfsense,ch1c4um/pfsense,NOYB/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,pfsense/pfsense,jxmx/pfsense,BlackstarGroup/pfsense,BlackstarGroup/pfsense,pfsense/pfsense,phil-davis/pfsense,brunostein/pfsense,brunostein/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,dennypage/pfsense,ptorsten/pfsense,brunostein/pfsense,ch1c4um/pfsense,NOYB/pfsense,phil-davis/pfsense,pfsense/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,dennypage/pfsense,pfsense/pfsense