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When users use the TLS CommonName based authentication, the authTokenBundle is always nil. But it's possible for the clients to get `rpctypes.ErrAuthOldRevision` response when the clients concurrently modify auth data (e.g, addUser, deleteUser etc.). In this case, there is no need to refresh the token; instead the clients just need to retry the operations (e.g. Put, Delete etc). Signed-off-by: Benjamin Wang <wachao@vmware.com>