Demote warning if the network select call was aborted (e.g. via a signal)

arch/ua_network_tcp.c

@@ -411,7 +411,7 @@ ServerNetworkLayerTCP_listen(UA_ServerNetworkLayer *nl, UA_Server *server,
     struct timeval tmptv = {0, timeout * 1000};
     if (UA_select(highestfd+1, &fdset, NULL, &errset, &tmptv) < 0) {
         UA_LOG_SOCKET_ERRNO_WRAP(
-            UA_LOG_WARNING(layer->logger, UA_LOGCATEGORY_NETWORK,
+            UA_LOG_DEBUG(layer->logger, UA_LOGCATEGORY_NETWORK,
                            "Socket select failed with %s", errno_str));
         // we will retry, so do not return bad
         return UA_STATUSCODE_GOOD;