Merge pull request #49112 from gmarek/eventAPI

Automatic merge from submit-queue (batch tested with PRs 55952, 49112, 55450, 56178, 56151). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

New API group for Events.

Fix kubernetes/features#383

cc @shyamjvs

```release-note
Add events.k8s.io api group with v1beta1 API containing redesigned Event type.
```

Kubernetes-commit: 60c20901911c710491a57eb8b9c48850cdbab054

vendor/k8s.io/api/events/v1beta1/doc.go

@@ -0,0 +1,21 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// +k8s:deepcopy-gen=package
+// +k8s:openapi-gen=true
+
+// +groupName=events.k8s.io
+package v1beta1