ETCM-168: Don't try to bond with the same neighbor again.

Author: aakoshh

scalanet/discovery/src/io/iohk/scalanet/discovery/ethereum/v4/DiscoveryService.scala

@@ -797,7 +797,7 @@ object DiscoveryService {
           ) >>
             Task
               .parTraverseUnordered(contacts)(fetchNeighbors)
-              .map(_.flatten.distinct)
+              .map(_.flatten.distinct.filterNot(neighbors))
               .flatMap(bondNeighbors)
               .flatMap { newNeighbors =>
                 val nextClosest = (closest ++ newNeighbors).take(config.kademliaBucketSize)