Delay retries for GET requests

[danfoster]

Hi,

In #508 , logic was added to retry requests. There is a delay added between retries if the request is a POST. Would it be suitable to suitable to add that delay for all HTTP methods?

The use-case I'm finding is try a GET request too early, before influxdb has finished starting. I'm therefore getting a Connection refused returned straight away. Even with a high number of retries (50), the lack of delay causes them to cycle through too quickly.