/// <summary>
/// Download a config from Zookeeper and write it to the filesystem
/// </summary>
/// <param name="configName">The config to download</param>
/// <param name="dir">The path to write files under</param>
/// <param name="token"></param>
/// <exception cref="IOException">If an I/O error occurs or the config does not exist</exception>
public async Task downloadConfigDir(string configName, string dir, CancellationToken token)
{
await zkClient.downloadFromZK(ConfigsZKnode + "/" + configName, dir, token);
}