Merge pull request #56175 from ericchiang/oidc-fix-prefixing

Automatic merge from submit-queue (batch tested with PRs 51494, 56097, 56072, 56175). 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>.

oidc auth: fix prefix flag plumbing

Fixes https://github.com/kubernetes/kubernetes/issues/56169

Tested this with an full API server against Google. It works now.

:(

cc @kubernetes/sig-auth-bugs 

```release-note
kube-apiserver: fixed --oidc-username-prefix and --oidc-group-prefix flags which previously weren't correctly enabled
```

/assign @liggitt @deads2k 

Probably worth a cherry pick.
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Kubernetes Submit Queue 2017-11-21 19:49:33 -08:00 committed by GitHub
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@ -294,8 +294,10 @@ func (s *BuiltInAuthenticationOptions) ToAuthenticationConfig() authenticator.Au
ret.OIDCCAFile = s.OIDC.CAFile
ret.OIDCClientID = s.OIDC.ClientID
ret.OIDCGroupsClaim = s.OIDC.GroupsClaim
ret.OIDCGroupsPrefix = s.OIDC.GroupsPrefix
ret.OIDCIssuerURL = s.OIDC.IssuerURL
ret.OIDCUsernameClaim = s.OIDC.UsernameClaim
ret.OIDCUsernamePrefix = s.OIDC.UsernamePrefix
}
if s.PasswordFile != nil {