WIP Enable configuration of bound service account tokens

[marun]

NOTE This PR is not mergeable until openshift/api#569 merges.

Implements operand support for openshift/enhancements#150.

[openshift-ci-robot]

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[sttts]

this commit needs a proper UPSTREAM: <carry>: ... commit msg.

[sttts]

Lgtm otherwise.

[stlaz]

You need to add validation for the ServiceAccountIssuer field to vendor/k8s.io/kubernetes/openshift-kube-apiserver/admission/customresourcevalidation/authentication/validate_authentication.go so that user config does not make the KAS pods crashloop

origin/vendor/k8s.io/kubernetes/pkg/kubeapiserver/options/authentication.go

Lines 173 to 175 in 0292713

	if s.ServiceAccounts != nil && len(s.ServiceAccounts.Issuer) > 0 && strings.Contains(s.ServiceAccounts.Issuer, ":") {
	if _, err := url.Parse(s.ServiceAccounts.Issuer); err != nil {
	allErrors = append(allErrors, fmt.Errorf("service-account-issuer contained a ':' but was not a valid URL: %v", err))

[marun]

Since the bound token flags are already exposed by the apiserver, this PR is not necessary.