### Other notable changes

* kube-up (with gce/gci and gce/coreos providers) now ensures the authentication token file contains correct tokens for the control plane components, even if the file already exists (ensures upgrades and downgrades work successfully) ([#43676](https://github.com/kubernetes/kubernetes/pull/43676), [@liggitt](https://github.com/liggitt))

            }
        } catch (final UnknownHostException uhe) {}

        w = new WriterThread();
        w.setDaemon(true);
        w.start();

        /* Downgrade one transport to the lower of the negotiated buffer sizes
         * so we can just send whatever is received.
         */

        final SmbTransport t1 = tree.session.transport;