use factory design pattern to refactor ZooKeeperMain

static {
    commandMap.put("connect", "host:port");
    commandMap.put("history", "");
    commandMap.put("redo", "cmdno");
    commandMap.put("printwatches", "on|off");
    commandMap.put("quit", "");

    new CloseCommand().addToMap(commandMapCli);
    new CreateCommand().addToMap(commandMapCli);
    new DeleteCommand().addToMap(commandMapCli);
    new DeleteAllCommand().addToMap(commandMapCli);
    // Depricated: rmr
    new DeleteAllCommand("rmr").addToMap(commandMapCli);
    new SetCommand().addToMap(commandMapCli);
    new GetCommand().addToMap(commandMapCli);
    new LsCommand().addToMap(commandMapCli);
    new Ls2Command().addToMap(commandMapCli);
    new GetAclCommand().addToMap(commandMapCli);
    new SetAclCommand().addToMap(commandMapCli);
    new StatCommand().addToMap(commandMapCli);
    new SyncCommand().addToMap(commandMapCli);
    new SetQuotaCommand().addToMap(commandMapCli);
    new ListQuotaCommand().addToMap(commandMapCli);
    new DelQuotaCommand().addToMap(commandMapCli);
    new AddAuthCommand().addToMap(commandMapCli);
    new ReconfigCommand().addToMap(commandMapCli);
    new GetConfigCommand().addToMap(commandMapCli);
    new RemoveWatchesCommand().addToMap(commandMapCli);
    new GetEphemeralsCommand().addToMap(commandMapCli);
    new GetAllChildrenNumberCommand().addToMap(commandMapCli);
    new VersionCommand().addToMap(commandMapCli);

    // add all to commandMap
    for (Entry<String, CliCommand> entry : commandMapCli.entrySet()) {
        commandMap.put(entry.getKey(), entry.getValue().getOptionStr());
    }
}