Net 662 convert pka to seconds vice nsec (#2627)

* force listenport/persisentkeepalive to defaults if 0 during migration

* convert pka to seconds vice nsec

controllers/migrate.go

@@ -154,7 +154,7 @@ func convertLegacyHostNode(legacy models.LegacyNode) (models.Host, models.Node)
 	host.IsDocker = models.ParseBool(legacy.IsDocker)
 	host.IsK8S = models.ParseBool(legacy.IsK8S)
 	host.IsStatic = models.ParseBool(legacy.IsStatic)
-	host.PersistentKeepalive = time.Duration(legacy.PersistentKeepalive)
+	host.PersistentKeepalive = time.Duration(legacy.PersistentKeepalive) * time.Second
 	if host.PersistentKeepalive == 0 {
 		host.PersistentKeepalive = models.DefaultPersistentKeepAlive
 	}