cleanup of eschecker

remove explicit doc_id based querying and just do view based, check index, modify and check index again for rev delta.

this is more general, albeit it will touch arbitrary docs and update their revs with a meaningless change.
update es checker tasks to reflect new escheck api
hqadmin system info updates

to reflect checking case, xform, reportcase and reportxform indices using new escheck method.

this necessitated an api cleanup of how the dicts are represented and iterated through, so it'd be easier to add more pillow/index checks to this page.
updating check_es_index checker to run every 6 hours
updating delay back to 3 seconds
updating docstring
Merge pull request #1650 from dimagi/reportindex_checking

Reportindex checking