libp2p: use actual unix timestamps for discover packets

libp2p/UDP.h

@@ -60,8 +60,8 @@ protected:
  */
 struct RLPXDatagramFace: public UDPDatagram
 {
-	static uint64_t futureFromEpoch(std::chrono::milliseconds _ms) { return std::chrono::duration_cast<std::chrono::milliseconds>((std::chrono::system_clock::now() + _ms).time_since_epoch()).count(); }
-	static uint64_t futureFromEpoch(std::chrono::seconds _sec) { return std::chrono::duration_cast<std::chrono::milliseconds>((std::chrono::system_clock::now() + _sec).time_since_epoch()).count(); }
+	static uint64_t futureFromEpoch(std::chrono::milliseconds _ms) { return std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now() + _ms).time_since_epoch()).count(); }
+	static uint64_t futureFromEpoch(std::chrono::seconds _sec) { return std::chrono::duration_cast<std::chrono::seconds>((std::chrono::system_clock::now() + _sec).time_since_epoch()).count(); }
 	static Public authenticate(bytesConstRef _sig, bytesConstRef _rlp);
 	
 	virtual uint8_t packetType() =0;