LP#1756142 Stream the reporter "schedule" retrieve-by-folder response

LP#1756142 Stream the reporter "schedule" retrieve-by-folder response

One of the options in the reporter when viewing future and past
reports (aka a "schedule") is to retrieve "all", but this eventually
results in a massive return value which clogs the OpenSRF pipes (or,
rather, doesn't fit at all).

Let's set this to stream the responses, which appears to work fine
in the current reporter interface without any other changes.

Signed-off-by: Dan Wells <dbw2@calvin.edu>