plugin/kubernetes: Enable protobuf, Update client api package (#1114)

* vendor

* code

vendor/k8s.io/client-go/CHANGELOG.md

@@ -0,0 +1,45 @@
+
+TODO: This document was neglected and is currently not complete. Working on
+fixing this.
+
+# HEAD (changes that will go into the next release)
+
+# v3.0.0-beta.0
+
+* Added dependency on k8s.io/apimachinery. The impacts include changing import path of API objects like `ListOptions` from `k8s.io/client-go/pkg/api/v1` to `k8s.io/apimachinery/pkg/apis/meta/v1`.
+* Added generated listers (listers/) and informers (informers/)
+* Kubernetes API changes:
+  * Added client support for:
+    * authentication/v1
+    * authorization/v1
+    * autoscaling/v2alpha1
+    * rbac/v1beta1
+    * settings/v1alpha1
+    * storage/v1
+  * Changed client support for:
+    * certificates from v1alpha1 to v1beta1
+    * policy from v1alpha1 to v1beta1
+* CHANGED: pass typed options to dynamic client (https://github.com/kubernetes/kubernetes/pull/41887)
+
+# v2.0.0
+
+* Included bug fixes in k8s.io/kuberentes release-1.5 branch, up to commit 
+  bde8578d9675129b7a2aa08f1b825ec6cc0f3420
+
+# v2.0.0-alpha.1
+
+* Removed top-level version folder (e.g., 1.4 and 1.5), switching to maintaining separate versions
+  in separate branches.
+* Clientset supported multiple versions per API group
+* Added ThirdPartyResources example
+* Kubernetes API changes
+  * Apps API group graduated to v1beta1 
+  * Policy API group graduated to v1beta1
+  * Added support for batch/v2alpha1/cronjob
+  * Renamed PetSet to StatefulSet
+  
+
+# v1.5.0
+
+* Included the auth plugin (https://github.com/kubernetes/kubernetes/pull/33334)
+* Added timeout field to RESTClient config (https://github.com/kubernetes/kubernetes/pull/33958)