NET-507 (#2506)

* NET-507

* Fixed server restart changing the node expiration date to the defaults.

* Removed expired nodes removal from zombie cleanup routine.

* Added a new expired nodes deletion routine which removes expired nodes every hour.

* NET-507 suggested changes

* Possible fix for zombie nodes upon node deletion from the UI.

* Suggested changes implemented for expired nodes deletion go routine.

* NET-507 typo fix

* typo fix for DeleteNode purge parameter

main.go

@@ -168,6 +168,7 @@ func runMessageQueue(wg *sync.WaitGroup, ctx context.Context) {
 	go func() {
 		peerUpdate := make(chan *models.Node)
 		go logic.ManageZombies(ctx, peerUpdate)
+		go logic.DeleteExpiredNodes(ctx, peerUpdate)
 		for nodeUpdate := range peerUpdate {
 			if err := mq.NodeUpdate(nodeUpdate); err != nil {
 				logger.Log(0, "failed to send peer update for deleted node: ", nodeUpdate.ID.String(), err.Error())