Remove ping pong from reply stage (#1745)

* Remove ping pong

* Remove ping pong code from reply stage

Co-authored-by: Gal Rogozinski <galrogogit@gmail.com>

src/main/java/com/iota/iri/network/pipeline/ReplyStage.java

@@ -146,16 +146,6 @@ public ProcessingContext process(ProcessingContext ctx) {
             return ctx;
         }
 
-        // we didn't have the requested transaction (random or explicit) from the neighbor but we will immediately reply
-        // with the latest known milestone and a needed transaction hash, to keep up the ping-pong
-        try {
-            final TransactionViewModel msTVM = TransactionViewModel.fromHash(tangle,
-                    latestMilestoneTracker.getLatestMilestoneHash());
-            neighborRouter.gossipTransactionTo(neighbor, msTVM, false);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-
         ctx.setNextStage(TransactionProcessingPipeline.Stage.FINISH);
         return ctx;
     }