Merge pull request #61213 from junxu/remove-deprecate-authorization-rbac-super-user

Automatic merge from submit-queue (batch tested with PRs 61087, 61075, 61213, 61149, 60826). 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>.

Remove deprecated paramter "authorization-rbac-super-user"

**What this PR does / why we need it**: As RBAC is v1 now, we need remove the deprecated  "authorization-rbac-super-user" paramter for RBAC alpha

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note

```
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Kubernetes Submit Queue 2018-03-21 06:41:30 -07:00 committed by GitHub
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@ -68,12 +68,6 @@ func (s *BuiltInAuthorizationOptions) AddFlags(fs *pflag.FlagSet) {
fs.DurationVar(&s.WebhookCacheUnauthorizedTTL,
"authorization-webhook-cache-unauthorized-ttl", s.WebhookCacheUnauthorizedTTL,
"The duration to cache 'unauthorized' responses from the webhook authorizer.")
fs.String("authorization-rbac-super-user", "", ""+
"If specified, a username which avoids RBAC authorization checks and role binding "+
"privilege escalation checks, to be used with --authorization-mode=RBAC.")
fs.MarkDeprecated("authorization-rbac-super-user", "Removed during alpha to beta. The 'system:masters' group has privileged access.")
}
func (s *BuiltInAuthorizationOptions) Modes() []string {