Upgrade pymongo usage from deprecated connection to client
LMS-1551
Change mitx.db to edx.db for dev sqlite
update LocMemCache location to use edx instead of mitx
On export error, handle quotes within string.

STUD-1013
import GlobalStaff to legacy.py (LMS-1599)
Disabled AJAX Errors Course Overview JS test
Shorten collection name to keep index name w/in limit
Removing work for BLD-465.

Separate PR handles BLD-465. PR 1856.
Fixing Python test fail.