... on proctored exam attempt deletion

JIRA:EDUCATOR-4642

Drop RUN_AS_ANALYTICS_SERVER_ENABLED

This is an ancient feature flag that uses an archived and
unsupported support library (edinsights, edx/insights).

DEPR-44

BOM-405

python3 compatibility

user agent regex updated in mobile platform

BOM-446

BOM-412

PR #21614 made this upgrade, but it was accidentally
undone by a later PR that merged an out-of-date
'make upgrade'.

EDUCATOR-4635

This is the third in a series of commits to create
a Python API for the LMS program_enrollments app.
It does the following:
* Creates api/ folder.
* Moves link_program_enrollments.py to api/linking.py
* Creates api/reading.py for enrollment-fetching
  functions.
* Updates rest of app to use api/reading.py when
  it was going directly through the models before.
* Other misc. cleanup (isorting, unicode_literals,
  line breaks, etc).

Still to do:
* Create api/writing.py and update app to use it instead
  of going directly through models.
* Create api/reset.py and api/expire.py, which the management
  commands call out to.

EDUCATOR-4321

This is similar to use_read_replica_if_available(),
but it just returns either 'read_replica' or
'default', for use with the Django ORM using()
method. Syntactically, it fits nicer with queryset
method-call chains.

BOM-472

BOM-411

Fix paver for python 3.

Feanil/fix bokchoy

BOM-471

We are currently running this plugin from a has directly off of master
to get support for a newer version of DJDT.  However even on master
there is not yet support for python 3.  We're running into this when
running runserver and when collecting static assets.

A quick survey of the development team at edX shows that people are no
longer actively using this debug panel.(14 responders all saying no to
the question "In the last year have you used the mongo portion of the
django-debug-toolbar in edx-platform?")

This makes sense since the module store and courseware related
developement is not very active right now.  Given all this, I'm removing
this toolbar for now and if we need it again we can survey what's
available at that time to choose the best tool.

Unfortunately snakefood is not supported in python3 so I'm removing it
and the tools built on top of it for now as they are not in active use.

If you're looking at this wishing it still existed,

Check out https://github.com/bwohlberg/jonga or https://pypi.org/project/findimports/

Fixing python3

Fixing python3

Fixing python3

test fixes

changes made as suggested

updated the variable name

send grace period info to edx-proctoring

BOM-238

BOM-455

LX-309 Modify CAPA choicegroup problems to make custom radio/checkboxes possible

BOM-404

BOM-409

Awais786/bom 416

BOM-426

BOM-444