Fixes bug 970406 - pull ADI/blocklist pings from Hive with crontabber

This job fetches ADI aggregates daily from Hive using a SQL query. Many thanks to @peterbe and @lars for help with the mocking, which proved to be daunting.
That version doesn't include the code in that commit for batching data fetches. Without that code, we cannot use this module. 
The branch I'm pointing to should be merged in the next 7-10 days, and I'll update our requirements.txt when that happens.