docs: static String getFetchCommand(Config localConfig, Config clusterConfig, Config runtime) {
      return String.format("%s -u %s -f . -m local -p %s -d %s",
          Context.downloaderBinary(clusterConfig),
          Runtime.topologyPackageUri(runtime).toString(), Context.heronConf(localConfig),
          Context.heronHome(clusterConfig));
    }