Merge pull request #4623 from rgacogne/rec-tcp-rfc7766-section10

rec: Add TCP management options described in section 10 of rfc7766

diff --cc docs/markdown/recursor/settings.md
Simple merge

diff --cc pdns/pdns_recursor.cc
index 9608e298ba83d004cbc4b131b5ef81938a85536d,bfdeac602fd39c39cf647656700fb0cbfe7dc534..bd79bb4a27a95211c0c4310818260a689a2dd453
--- 1/pdns/pdns_recursor.cc
--- 2/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@@ -91,8 -91,9 +91,9 @@@ extern SortList g_sortlist
  #endif
  
  __thread FDMultiplexer* t_fdm;
 -__thread unsigned int t_id;
 +static __thread unsigned int t_id;
  unsigned int g_maxTCPPerClient;
+ size_t g_tcpMaxQueriesPerConn;
  unsigned int g_networkTimeoutMsec;
  uint64_t g_latencyStatSize;
  bool g_logCommonErrors;

diff --cc pdns/syncres.hh
Simple merge