Retry on bad status code

[maingoh]

Feature Request

It looks like we can activate a retry on some network errors, though I didn't find a way to retry automatically on some 5xx status code. It would be nice to set it from the driver constructor.

[maingoh]

This probably involve to raise specific exceptions that store the HTTP code instead of raising generic LibCloudError and parsing the code from in the error message https://github.com/apache/libcloud/blob/fe4f81b5a31a8f470ff6ba5af7451cccfc423c2b/libcloud/storage/base.py#L716

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