In swift.proxy.Controller, logic in account_info and container_info is problematic

In both methods, result_code is not set properly.

If all the nodes return a 404, the response code should be a 404 instead of a -1.

Also, in account_info(), the logic for returning (partition, nodes) versus (None, None) is different when the response code is retrieved from memcache instead of determined by making requests of the nodes.

That logic should be, if the result_code is 200, return (partition, nodes) and if not return (None, None) in both places.