//DeleteObject calls the OpenStack delete object API using
//previously obtained token.
//
//Note from API doc: "A DELETE to a versioned object removes the current version
//of the object and replaces it with the next-most current version, moving it
//from the non-current container to the current." .. "If you want to completely
//remove an object and you have five total versions of it, you must DELETE it
//five times."
func DeleteObject(session *openstack.Session, url string) (err error) {
	resp, err := session.Delete(url, nil, nil)
	if err != nil {
		return err
	}
	defer resp.Body.Close() // CF
	return util.CheckHTTPResponseStatusCode(resp)
}