Merge pull request #4388 from rgacogne/rec-rpz-default-policy-ixfr

rec: Fix RPZ default policy not being applied over IXFR

diff --cc pdns/rec-lua-conf.cc
Simple merge

diff --cc pdns/reczones.cc
index 9df123ddfead4fdd12c1a6d3ebe718086eec2f8c,12237aa3341505e9982ba677a57417d9ce42cc22..c5b17034f4c819027df3c5634ffe04ecdeb4ad75
--- 1/pdns/reczones.cc
--- 2/pdns/reczones.cc
+++ b/pdns/reczones.cc
@@@ -344,11 -344,9 +344,11 @@@ void RPZIXFRTracker(const ComboAddress
        const auto& add = delta.second;
        if(remove.empty()) {
          L<<Logger::Warning<<"IXFR update is a whole new zone"<<endl;
-         luaconfsCopy.dfe.clear(0);
+         luaconfsCopy.dfe.clear(polZone);
        }
        for(const auto& rr : remove) { // should always contain the SOA
 +        if(rr.d_type == QType::NS)
 +          continue;
        totremove++;
        if(rr.d_type == QType::SOA) {
          auto oldsr = getRR<SOARecordContent>(rr);