Do not duplicate domain check

urlchecker_dns.py

@@ -112,5 +112,7 @@ def getServerIpDict(db, status_id, resolver_dict, domain_list, rdtype):
             for address in answer_list:
                 if address not in server_ip_dict:
                     server_ip_dict[address] = []
+                if domain_text not in server_ip_dict[address]:
+                  # Do not duplicate the domain
                   server_ip_dict[address].append(domain_text)
     return server_ip_dict