Merge pull request #12395 from zjs604381586/fixed-negcache

When the stale function is triggered, wrong data can be returned from negcache and record cache

diff --cc pdns/recursordist/negcache.cc
Simple merge

diff --cc pdns/recursordist/syncres.cc
Simple merge

diff --cc pdns/recursordist/test-syncres_cc10.cc
Simple merge