contact retry handle engine shutdown better

app/plugins/contactRetry.go

@@ -255,6 +255,17 @@ func (cr *contactRetry) run() {
 			case event.ProtocolEngineShutdown:
 				cr.ACNUp = false
 				cr.protocolEngine = false
+
+				cr.connections.Range(func(k, v interface{}) bool {
+					p := v.(*contact)
+					if p.state == connections.AUTHENTICATED || p.state == connections.SYNCED {
+						p.lastSeen = time.Now()
+					}
+					p.state = connections.DISCONNECTED
+					p.failedCount = 0
+					return true
+				})
+
 			case event.ACNStatus:
 				prog := e.Data[event.Progress]
 				if !cr.protocolEngine {