[WIP]net: add updateValues to replace Listen operations

Actually, packets are not retransmitted for listen operations. This
leads to some problems when they are already several values present
at one hash. Ideally, packets should be transmitted inside a request
to avoid packet loss and get all datas.

This patch breaks the compatibility with previous versions

src/dht.cpp

@@ -605,7 +605,7 @@ Dht::searchSynchedNodeListen(const Sp<Search>& sr, SearchNode& n)
             });
         }
         auto prev_req = r != n.listenStatus.end() ? r->second.req : nullptr;
-        auto new_req = network_engine.sendListen(n.node, sr->id, *query, n.token, prev_req,
+        auto new_req = network_engine.sendUpdateValues(n.node, sr->id, *query, n.token, prev_req,
             [this,ws,query](const net::Request& req, net::RequestAnswer&& answer) mutable
             { /* on done */
                 if (auto sr = ws.lock()) {