revert pillow version

was causing issues with PT exam configuration dashboard launch

This reverts commit 544c7f7e.

This is necessary to allow new proctoring backends to mark proctored
attempts in error, often due to unuploaded files from the application
or issues with multiple sets of files attached to the same testing
session.

Fixes: https://openedx.atlassian.net/browse/INCR-16

- Remove second_review_required step for failed onboarding exams
- Timed-out exams should also trigger automatic file upload

JIRA:EDUCATOR-4153 and JIRA:EDUCATOR-4162, respectively

JIRA:EDUCATOR-4105

Extra constraints needed to be added for pytest-randomly and tornado,
both of which have dropped Python 2 support.

PLAT-2424

Update deprecated pygeoip
to geoip2 and all usages
of it

Learner-6238

Also update a mistake in studio markup related to proctored exams

JIRA:EDUCATOR-4048

ran make upgrade, but not upgrading pytest or pytest-forked to try to isolate travis test failures

Running make upgrade again