ValidatePolicyRule is exported to allow types outside of the RBAC API group to embed a rbac.PolicyRule and reuse this validation logic.

ValidateRBACName is exported to allow types outside of the RBAC API group to reuse this validation logic Minimal validation of names for roles and bindings.

ValidateRoleBindingSubject is exported to allow types outside of the RBAC API group to embed a rbac.Subject and reuse this validation logic.