Delete backups from etcd if they're not in storage

This fixes #309.

Signed-off-by: Carlisia <carlisia@grokkingtech.io>

Co-authored-by: Steve Kriss <steve@heptio.com>

pkg/cmd/server/server.go

@@ -534,6 +534,7 @@ func (s *server) runControllers(config *api.Config) error {
 		config.BackupStorageProvider.Bucket,
 		config.BackupSyncPeriod.Duration,
 		s.namespace,
+		s.sharedInformerFactory.Ark().V1().Backups(),
 		s.logger,
 	)
 	wg.Add(1)