Add CHANGELOG-1.8.md for v1.8.1.

CHANGELOG-1.8.md

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+<!-- BEGIN MUNGE: GENERATED_TOC -->
+- [v1.8.1](#v181)
+  - [Downloads for v1.8.1](#downloads-for-v181)
+    - [Client Binaries](#client-binaries)
+    - [Server Binaries](#server-binaries)
+    - [Node Binaries](#node-binaries)
+  - [Changelog since v1.8.0](#changelog-since-v180)
+    - [Action Required](#action-required)
+    - [Other notable changes](#other-notable-changes)
+<!-- END MUNGE: GENERATED_TOC -->
+
+<!-- NEW RELEASE NOTES ENTRY -->
+
+
+# v1.8.1
+
+[Documentation](https://docs.k8s.io) & [Examples](https://releases.k8s.io/release-1.8/examples)
+
+## Downloads for v1.8.1
+
+
+filename | sha256 hash
+-------- | -----------
+[kubernetes.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes.tar.gz) | `15bf424a40544d2ff02eeba00d92a67409a31d2139c78b152b7c57a8555a1549`
+[kubernetes-src.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-src.tar.gz) | `b2084cefd774b4b0ac032d80e97db056fcafc2d7549f5a396dc3a3739f2d7a0b`
+
+### Client Binaries
+
+filename | sha256 hash
+-------- | -----------
+[kubernetes-client-darwin-386.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-darwin-386.tar.gz) | `78dfcdc6f2c1e144bcce700b2aa179db29150b74f54335b4f5e36f929e56ee4b`
+[kubernetes-client-darwin-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-darwin-amd64.tar.gz) | `bce8609e99ed8f0c4ccd8e9b275b8140030fee531fab6f01a755d563442240b4`
+[kubernetes-client-linux-386.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-386.tar.gz) | `13beeea6846b19648fc09ffe345bca32ea52e041e321b787e243e9b35b2c1b83`
+[kubernetes-client-linux-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-amd64.tar.gz) | `d7341402fe06f08e757f901674d2fb43d75161ac53bf2f41a875668e5ac2dad0`
+[kubernetes-client-linux-arm64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-arm64.tar.gz) | `aab4505e13f12a5cadbdb3980e5f8a5144b410c3d04bb74b8f25d2680908fb5c`
+[kubernetes-client-linux-arm.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-arm.tar.gz) | `aec3a3eeb64f22055acf6b16e82449435786f2bd578feb11847d53414c40c305`
+[kubernetes-client-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-ppc64le.tar.gz) | `72660598408b03ec428b3ba389c96ad6e2f3a036c7059d3760d34722ed0654fb`
+[kubernetes-client-linux-s390x.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-linux-s390x.tar.gz) | `5a02d0eb9987b0a32f22a82aa12a13e8f9fd8504d2339017f17881c48817ddfb`
+[kubernetes-client-windows-386.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-windows-386.tar.gz) | `2fda2cfe470254a1c109d7311f33fb6566f41bd34ec25f49b6c28802eecfb831`
+[kubernetes-client-windows-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-client-windows-amd64.tar.gz) | `2a7403be3bdcffd8907f59b144dca0378c0ffc014fd60282924e83ea743d0017`
+
+### Server Binaries
+
+filename | sha256 hash
+-------- | -----------
+[kubernetes-server-linux-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-server-linux-amd64.tar.gz) | `8c7fc5b99be7dc6736bea5cabe06ef2c60765df1394cd1707e49a3eb8b8a3c8d`
+[kubernetes-server-linux-arm64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-server-linux-arm64.tar.gz) | `812fbc06ca1df8c926b29891346c5737677a75b644591697a536c8d1aa834b2e`
+[kubernetes-server-linux-arm.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-server-linux-arm.tar.gz) | `cc612f34b9d95ae49b02e1e772ff26b518a1e157c10e6147a13bafa4710b3768`
+[kubernetes-server-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-server-linux-ppc64le.tar.gz) | `3ba0a6c6241fc70055acffbd16835c335f702ebf27d596e8b1d6e9cf7cd8d8f8`
+[kubernetes-server-linux-s390x.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-server-linux-s390x.tar.gz) | `cd0a731663b0f95cdaefcd54166ecf917cc2ddb470a3ed96f16f0cae9604f969`
+
+### Node Binaries
+
+filename | sha256 hash
+-------- | -----------
+[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-linux-amd64.tar.gz) | `4fccb39e01fb6f2e9120a03b3600d85079138086d8b39bdfb410b2738e6c17c4`
+[kubernetes-node-linux-arm64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-linux-arm64.tar.gz) | `8b7578c1b39d2f525e28afbc56701b69d0c0d0b3b361d6c28740b40ffbeb7ffa`
+[kubernetes-node-linux-arm.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-linux-arm.tar.gz) | `71eac41487d6226beb654c3a2fb49bb8f08ba38d6c844bb6588528325ba2ede9`
+[kubernetes-node-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-linux-ppc64le.tar.gz) | `5ebece4e189257ba95d1b39c7d1b00fb4d0989a806aa2b76eb42f9a6300c4695`
+[kubernetes-node-linux-s390x.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-linux-s390x.tar.gz) | `a0a6658ee44d0e92c0f734c465e11262de6a6920d283e999e5b7ed5bab865403`
+[kubernetes-node-windows-amd64.tar.gz](https://dl.k8s.io/v1.8.1/kubernetes-node-windows-amd64.tar.gz) | `3381d308aef709ccaf2c9357ac2a0166d918ba06dc1128b20736df9667284599`
+
+## Changelog since v1.8.0
+
+### Action Required
+
+* PodSecurityPolicy: Fixes a compatibility issue that caused policies that previously allowed privileged pods to start forbidding them, due to an incorrect default value for `allowPrivilegeEscalation`. PodSecurityPolicy objects defined using a 1.8.0 client or server that intended to set `allowPrivilegeEscalation` to `false` must be reapplied after upgrading to 1.8.1. ([#53443](https://github.com/kubernetes/kubernetes/pull/53443), [@liggitt](https://github.com/liggitt))
+
+### Other notable changes
+
+* Fix to prevent downward api change break on older versions ([#53673](https://github.com/kubernetes/kubernetes/pull/53673), [@timothysc](https://github.com/timothysc))
+* Ignore extended resources that are not registered with kubelet during container resource allocation. ([#53547](https://github.com/kubernetes/kubernetes/pull/53547), [@jiayingz](https://github.com/jiayingz))
+* GCE: Bump GLBC version to [0.9.7](https://github.com/kubernetes/ingress/releases/tag/0.9.7). ([#53625](https://github.com/kubernetes/kubernetes/pull/53625), [@nikhiljindal](https://github.com/nikhiljindal))
+* kubeadm 1.8 now properly handles upgrades from to 1.7.x to newer release in 1.7 branch ([#53338](https://github.com/kubernetes/kubernetes/pull/53338), [@kad](https://github.com/kad))
+* Add generate-groups.sh and generate-internal-groups.sh to k8s.io/code-generator to easily run generators against CRD or User API Server types. ([#52186](https://github.com/kubernetes/kubernetes/pull/52186), [@sttts](https://github.com/sttts))
+* Don't remove extended resource capacities that are not registered with kubelet from node status. ([#53353](https://github.com/kubernetes/kubernetes/pull/53353), [@jiayingz](https://github.com/jiayingz))
+* kubeadm allows the kubelets in the cluster to automatically renew their client certificates ([#53252](https://github.com/kubernetes/kubernetes/pull/53252), [@kad](https://github.com/kad))
+* Bumped Heapster version to 1.4.3 - more details https://github.com/kubernetes/heapster/releases/tag/v1.4.3. ([#53377](https://github.com/kubernetes/kubernetes/pull/53377), [@loburm](https://github.com/loburm))
+* Change `kubeadm create token` to default to the group that almost everyone will want to use.  The group is system:bootstrappers:kubeadm:default-node-token and is the group that kubeadm sets up, via an RBAC binding, for auto-approval (system:certificates.k8s.io:certificatesigningrequests:nodeclient). ([#53512](https://github.com/kubernetes/kubernetes/pull/53512), [@jbeda](https://github.com/jbeda))
+* GCE: Fix issue deleting internal load balancers when the firewall resource may not exist. ([#53450](https://github.com/kubernetes/kubernetes/pull/53450), [@nicksardo](https://github.com/nicksardo))
+* GCE: Fixes ILB sync on legacy networks and auto networks with unique subnet names ([#53410](https://github.com/kubernetes/kubernetes/pull/53410), [@nicksardo](https://github.com/nicksardo))
+* Fix the bug that query Kubelet's stats summary with CRI stats enabled results in error. ([#53107](https://github.com/kubernetes/kubernetes/pull/53107), [@Random-Liu](https://github.com/Random-Liu))
+* kubelet `--cert-dir` now defaults to `/var/lib/kubelet/pki`, in order to ensure bootstrapped and rotated certificates persist beyond a reboot. resolves an issue in kubeadm with false-positive `/var/lib/kubelet is not empty` message during pre-flight checks ([#53317](https://github.com/kubernetes/kubernetes/pull/53317), [@liggitt](https://github.com/liggitt))
+* Fix permissions for Metrics Server. ([#53330](https://github.com/kubernetes/kubernetes/pull/53330), [@kawych](https://github.com/kawych))
+* Fixes a performance issue ([#51899](https://github.com/kubernetes/kubernetes/pull/51899)) identified in large-scale clusters when deleting thousands of pods simultaneously across hundreds of nodes, by actively removing containers of deleted pods, rather than waiting for periodic garbage collection and batching resulting pod API deletion requests. ([#53233](https://github.com/kubernetes/kubernetes/pull/53233), [@dashpole](https://github.com/dashpole))
+* Fixes an issue with RBAC reconciliation that could cause duplicated subjects in some bootstrapped rolebindings on each restart of the API server. ([#53239](https://github.com/kubernetes/kubernetes/pull/53239), [@enj](https://github.com/enj))
+* Change ImageGCManage to consume ImageFS stats from StatsProvider ([#53094](https://github.com/kubernetes/kubernetes/pull/53094), [@yguo0905](https://github.com/yguo0905))
+* Fixes an issue with `kubectl set` commands encountering conversion errors for ReplicaSet and DaemonSet objects ([#53158](https://github.com/kubernetes/kubernetes/pull/53158), [@liggitt](https://github.com/liggitt))
+