Annotate cases where we build DNSZoneRecord with domain_id not known.

Signed-off-by: Miod Vallat <miod.vallat@powerdns.com>

Author: miodvallat

pdns/dnsproxy.cc

@@ -318,6 +318,7 @@ void DNSProxy::mainloop()
                 dzr.dr.d_ttl = answer.d_ttl;
                 dzr.dr.d_place = answer.d_place;
                 dzr.dr.setContent(answer.getContent());
+                // NOTE dzr.domain_id == UnknownDomainID
                 iter->second.complete->addRecord(std::move(dzr));
               }
             }

pdns/packethandler.cc

@@ -325,6 +325,7 @@ int PacketHandler::doChaosRequest(const DNSPacket& p, std::unique_ptr<DNSPacket>
     rr.dr.d_name=target;
     rr.dr.d_type=QType::TXT;
     rr.dr.d_class=QClass::CHAOS;
+    // NOTE rr.domain_id == UnknownDomainID
     r->addRecord(std::move(rr));
     return 1;
   }

pdns/stubresolver.cc

@@ -186,6 +186,7 @@ int stubDoResolve(Logr::log_t slog, const DNSName& qname, uint16_t qtype, vector
           DNSZoneRecord zrr;
           zrr.dr = answer;
           zrr.auth = true;
+          // NOTE zrr.domain_id == UnknownDomainID
           ret.push_back(std::move(zrr));
         }
       }

pdns/tkey.cc

@@ -115,6 +115,7 @@ void PacketHandler::tkeyHandler(const DNSPacket& p, std::unique_ptr<DNSPacket>&
   zrr.dr.d_class = QClass::ANY;
   zrr.dr.setContent(std::move(tkey_out));
   zrr.dr.d_place = DNSResourceRecord::ANSWER;
+  // NOTE zrr.domain_id == UnknownDomainID
   r->addRecord(std::move(zrr));
 
 #ifdef ENABLE_GSS_TSIG