* Add a timeout to the sshDialer to prevent indefinite hangs. ([#23843](https://github.com/kubernetes/kubernetes/pull/23843), [@cjcullen](https://github.com/cjcullen))
* AWS kube-up: tolerate a lack of ephemeral volumes ([#23776](https://github.com/kubernetes/kubernetes/pull/23776), [@justinsb](https://github.com/justinsb))

 *  Fix: Don't use brackets formatting IPv6 host names in MockWebServer.
 *  Fix: Don't permit cache iterators to remove entries that are being written.


## Version 4.0.1

_2019-07-10_

 *  Fix: Tolerate null-hostile lists in public API. Lists created with `List.of(...)` don't like it
    when you call `contains(null)` on them!
 *  Fix: Retain binary-compatibility in `okhttp3.internal.HttpHeaders.hasBody()`. Some unscrupulous

* fluentd will tolerate all NoExecute Taints when run in gcp configuration. ([#45715](https://github.com/kubernetes/kubernetes/pull/45715), [@gmarek](https://github.com/gmarek))

* Fixed controller manager crash by making it tolerant to discovery errors.([#49767](https://github.com/kubernetes/kubernetes/pull/49767), [@deads2k](https://github.com/deads2k))

* Fix kubectl get -f <file> -o <nondefault printer> so it prints all items in the file ([#39038](https://github.com/kubernetes/kubernetes/pull/39038), [@ncdc](https://github.com/ncdc))
* Endpoints, that tolerate unready Pods, are now listing Pods in state Terminating as well ([#37093](https://github.com/kubernetes/kubernetes/pull/37093), [@simonswine](https://github.com/simonswine))

- Kubeadm: tolerate whitespace when validating certificate authority PEM data in kubeconfig files ([#86705](https://github.com/kubernetes/kubernetes/pull/86705), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

* Add zsh completion for kubectl ([#23797](https://github.com/kubernetes/kubernetes/pull/23797), [@sttts](https://github.com/sttts))
* AWS kube-up: tolerate a lack of ephemeral volumes ([#23776](https://github.com/kubernetes/kubernetes/pull/23776), [@justinsb](https://github.com/justinsb))

### Other notable changes

    assertThat(get.headers["Host"]).isEqualTo("android.com")
    assertThat(hostnameVerifier.calls).isEqualTo(
      Arrays.asList("verify android.com"),
    )
  }

  /** Tolerate bad https proxy response when using HttpResponseCache. Android bug 6754912.  */
  @Test
  fun connectViaHttpProxyToHttpsUsingBadProxyAndHttpResponseCache() {
    initResponseCache()

- `kubeadm`: will now allow deploying a kubelet that is 3 versions older than the version of `kubeadm` (N-3). This aligns with the recent change made by SIG Architecture that extends the support skew between the control plane and kubelets. Tolerate this new kubelet skew for the commands `init`, `join` and `upgrade`. Note that if the `kubeadm` user applies a control plane version that is older than the `kubeadm` version (N-1 maximum) then the skew between the kubelet and control plane would...