there is a bug in boto where:

- in boto-2.6 if I only pass max_results=n it will fetch all items
- in boto-2.7 if I only pass request_limit it will endup sending Limit = -1

Now I always pass request_limit AND max_results (set both to the same value) so that I get the expected result (FETCH only the request number and RETURN only the requested number)