Allow forwarding devices to respond to tracert_requests

Things like switches could not be tracert'd.

Scenario: Level 3 It is dead, Jim.
1.) from PC2, do a tracert to net_switch0.
Notice that there is no response.

EduNetworkBuilder/NetworkDevice.cs

@@ -3210,14 +3210,16 @@ namespace EduNetworkBuilder
                 }
             }
 
-            if (!ForwardsPackets())
+            if (!ForwardsPackets() || HasIPAddress(tPacket.destIP))
             {
                 //Traceroute bounce-back
-                if(tPacket.MyType == PacketType.tracert_request)
+                if (tPacket.MyType == PacketType.tracert_request)
                 {
                     if (ProcessTracertPacket(tPacket)) return; //the packet stops if it gets bounced.
                 }
-
+            }
+            if (!ForwardsPackets())
+            { 
                 if (tPacket.MyType == PacketType.dhcp_request && !isDHCPServer)
                 {
                     tPacket.AddMessage(DebugLevel.debug, NB.LeftPad(hostname) + " " +string.Format(NB.Translate("ND_DoInFromLnkDeaf")));