Merge pull request #10432 from mind04/pdns-zonecache

auth: zone-cache improvements

diff --cc modules/bindbackend/bindbackend2.cc
Simple merge

diff --cc modules/bindbackend/bindbackend2.hh
Simple merge

diff --cc modules/remotebackend/remotebackend.cc
Simple merge

diff --cc modules/remotebackend/remotebackend.hh
Simple merge

diff --cc pdns/backends/gsql/gsqlbackend.cc
Simple merge

diff --cc pdns/backends/gsql/gsqlbackend.hh
Simple merge

diff --cc pdns/dnsbackend.hh
Simple merge