SSU2: Send termination in response to termination

router/java/src/net/i2p/router/transport/udp/PeerState2.java

@@ -630,6 +630,10 @@ public class PeerState2 extends PeerState implements SSU2Payload.PayloadCallback
     public void gotTermination(int reason, long count) {
         if (_log.shouldInfo())
             _log.info("Got TERMINATION block, reason: " + reason + " count: " + count + " on " + this);
+        if (reason != SSU2Util.REASON_TERMINATION) {
+            UDPPacket pkt = _transport.getBuilder2().buildSessionDestroyPacket(SSU2Util.REASON_TERMINATION, this);
+            _transport.send(pkt);
+        }
         _transport.getEstablisher().receiveSessionDestroy(_remoteHostId, this);
     }