rsapi/rsapi.go
func (a *API) CanAuthenticate() error {
	res := a.Auth.CanAuthenticate(a.Host)
	return res
}
func (a *API) CanAuthenticate() error {
	res := a.Auth.CanAuthenticate(a.Host)
	return res
}
// CanAuthenticate makes a test authenticated request to the RightScale API and returns an error
// if it fails.