improve logic to sending to broker (#166)
improve logic to sending to broker (#166)

1. Increase default timeout to 5s to avoid error in network jitter scenarios;
2. do not re-send request if meet TTransportException
imay/palo,cyongli/palo,cyongli/palo,cyongli/palo,imay/palo,lingbin/palo,lingbin/palo,cyongli/palo,lingbin/palo,imay/palo,imay/palo,cyongli/palo,imay/palo,lingbin/palo,morningman/palo,morningman/palo,morningman/palo,lingbin/palo,cyongli/palo,morningman/palo,lingbin/palo,morningman/palo,imay/palo,morningman/palo