etcdserver/api/v2discovery/discovery.go
func GetCluster(lg *zap.Logger, durl, dproxyurl string) (string, error) {
	d, err := newDiscovery(lg, durl, dproxyurl, 0)
	if err != nil {
		return "", err
	}
	return d.getCluster()
}
func GetCluster(lg *zap.Logger, durl, dproxyurl string) (string, error) {
	d, err := newDiscovery(lg, durl, dproxyurl, 0)
	if err != nil {
		return "", err
	}
	return d.getCluster()
}
// GetCluster will connect to the discovery service at the given url and
// retrieve a string describing the cluster