dnsdist: Really disable REUSEADDR on outgoing UDP client sockets

It turns out that our `Socket::bind()` will _helpfully_ enable this
by default.

(cherry picked from commit 20f67fee9447069d4586a41254468ac060b2d65e)

diff --git a/pdns/dnsdistdist/dnsdist-healthchecks.cc b/pdns/dnsdistdist/dnsdist-healthchecks.cc
index fc831e6481e94b051d45d652162a1fe12e46fd0c..ab147cb15014eb533b834c2f846523f04c237cf1 100644 (file)
--- a/pdns/dnsdistdist/dnsdist-healthchecks.cc
+++ b/pdns/dnsdistdist/dnsdist-healthchecks.cc
@@ -327,7 +327,7 @@ bool queueHealthCheck(std::unique_ptr<FDMultiplexer>& mplexer, const std::shared
         SSetsockopt(sock.getHandle(), SOL_IP, IP_BIND_ADDRESS_NO_PORT, 1);
       }
 #endif
-      sock.bind(ds->d_config.sourceAddr);
+      sock.bind(ds->d_config.sourceAddr, false);
     }
 
     auto data = std::make_shared<HealthCheckData>(*mplexer, ds, std::move(checkName), checkType, checkClass, queryID);