tidb-scheduler should have events.k8s.io permission

[cofyc]

Bug Report

What version of Kubernetes are you using?

1.6.0

What version of TiDB Operator are you using?

1.0.5

What did you expect to see?

What did you see instead?

tidb-scheduelr/kube-scheduler has the following error:

E1217 11:04:17.146944       1 event_broadcaster.go:235] Server rejected event '&v1beta1.Event{TypeMeta:v1.TypeMeta{Kind:"", APIVersion:""}, ObjectMeta:v1.ObjectMeta{Name:"tidb-cluster-prod-pd-1.15e123c12cf0373c", GenerateName:"", Namespace:"tidb-cluster-prod", SelfLink:"", UID:"", ResourceVersion:"", Generation:0, CreationTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}}, DeletionTimestamp:(*v1.Time)(nil), DeletionGracePeriodSeconds:(*int64)(nil), Labels:map[string]string(nil), Annotations:map[string]string(nil), OwnerReferences:[]v1.OwnerReference(nil), Finalizers:[]string(nil), ClusterName:"", ManagedFields:[]v1.ManagedFieldsEntry(nil)}, EventTime:v1.MicroTime{Time:time.Time{wall:0xbf764b6c48b35899, ext:6478642925306, loc:(*time.Location)(0x2eeb620)}}, Series:(*v1beta1.EventSeries)(nil), ReportingController:"tidb-scheduler", ReportingInstance:"tidb-scheduler-tidb-scheduler-7644b5cb87-rn4fz", Action:"Scheduling", Reason:"FailedScheduling", Regarding:v1.ObjectReference{Kind:"Pod", Namespace:"tidb-cluster-prod", Name:"tidb-cluster-prod-pd-1", UID:"070d83d1-a4a4-4735-8df4-cc7206abebc3", APIVersion:"v1", ResourceVersion:"4500741", FieldPath:""}, Related:(*v1.ObjectReference)(nil), Note:"Failed filter with extender at URL http://127.0.0.1:10262/scheduler/filter, code 500", Type:"Warning", DeprecatedSource:v1.EventSource{Component:"tidb-scheduler", Host:""}, DeprecatedFirstTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}}, DeprecatedLastTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}}, DeprecatedCount:0}': 'events.events.k8s.io is forbidden: User "system:serviceaccount:tidb-admin:tidb-scheduler" cannot create resource "events" in API group "events.k8s.io" in the namespace "tidb-cluster-prod"' (will not retry!)

This is because kube-scheduler use events v1beta API (if enabled) since v1.16.

xref: kubernetes/kubernetes#78447, kubernetes/kubernetes#83692

[cofyc]

closed via #1355
tidb-scheduler/kube-scheduler will use the same clusterroles as kube-system/kube-scheduler does.

[cofyc]

#1355 needs to be cherry-picked into release-1.0.

[cofyc]

closed via #1423.