updated the constraints order

- Updating Python Requirements
- Fix cache key generation to use class name and module

This was stringifying the class object directly, resulting in cache keys
like `:1:<class 'xblock_django.models.XBlockConfiguration'>.xblock_django.api.deprecated_xblocks`
which then cause breakage when Django 2.2.13 validates the keys.

Co-authored-by: edX requirements bot <testeng+edx-requirements-bot@edx.org>

Remove pystache_custom dependency.
Upgrade requirements.

https://openedx.atlassian.net/browse/BOM-1670

Move sorl-thumbnail dependencie from github.in to base.in since PyPi version is now compatible with DJango 2.2 and python 3.5.

ENT-2577

Remove pandas requirement.
Replace pandas functionality with itertools.group_by.

and make upgrade.

We will now show the problem icon if the LTI problem
is scored and 'other' if it is not.

* Enterprise: Bump to v3.2.17

* ran make upgrade to upgrade all dependencies

Co-authored-by: Adam Stankiewicz <agstanki@gmail.com>

* Updating Python Requirements

* Pin django-pipeline and lxml

Co-authored-by: Jeremy Bowman <jbowman@edx.org>

This reverts commit 1d7ff32a.

Cleaned up a few more things about the testing configuration now that we've deployed Django 2.2 to production:

* Go back to a single version of django-oauth-toolkit, tox doesn't need to vary it anymore
* Go back to PyPI release of django-method-override
* Remove no longer needed dependency on python-oauth2 (we already removed the package it was used by)
* Update prepare_xdist_nodes.sh with new Django requirements file options

This reverts commit 27480a25.

* Updating Python Requirements

* Constrain django-cookies-samesite until dep bug fixed

* Fix PEP 8 problems revealed by pycodestyle upgrade

Co-authored-by: Tim McCormack <tmccormack@edx.org>
Co-authored-by: Jeremy Bowman <jbowman@edx.org>

Revert "Dark launch: Fix site shadowing and 1+N queries in third party auth config fetching (#23824)" (#23935)

This reverts commit 79420640.

This performs a dark launch compare of the existing implementation
(still in use) for fetching TPA provider configs and a new
implementation, recording metrics on exceptions and mismatches.

The new implementation should have two benefits, once we're switched
over:

- Fix 1+N queries on login page view where the site for each config
  was fetched in a loop (ARCHBOM-1139)
- Don't allow configs with the same key on different sites to
  interfere with each other (regression test added)

The new impl does not use TieredCache, but only the request cache,
which we may want to adjust later.