Our current sandbox provisioning uses a create_user management command,
which creates and enrolls a user into a course. However, for TE-1128, we
will need a way to enroll the same user to multiple courses (which are
dynamic at time of provisioning). Using the existing management
command is no longer feasible for that, so we are using one that accesses
the enrollment API, which is the new standard for new enrollment capabilities.

This reverts commit 3149aaa3.

This allows the edX REST API Client to perform a sucessful GET against
this API, since Slumber (which our client is based off of) appends the
trailing slash by default.

TNL-2180

ECOM-2972

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

Also remove useless docstrings where they were added to keep pylint
quiet.

https://github.com/edx/edx-platform/pull/9345

* Upgrade edx-submissions
* Upgrade edx-ora2
* Upgrade edx-val
* Upgrade edx-proctoring
* Update all edx-platform code that depends on DRF, including:
  - auth_exchange
  - cors_csrf
  - embargo
  - enrollment
  - util
  - commerce
  - course_structure
  - discussion_api
  - mobile_api
  - notifier_api
  - teams
  - credit
  - profile_images
  - user_api
  - lib/api (OAuth2 and pagination)

* Upgrade edx-submissions
* Upgrade edx-ora2
* Upgrade edx-val
* Upgrade edx-proctoring
* Update all edx-platform code that depends on DRF, including:
  - auth_exchange
  - cors_csrf
  - embargo
  - enrollment
  - util
  - commerce
  - course_structure
  - discussion_api
  - mobile_api
  - notifier_api
  - teams
  - credit
  - profile_images
  - user_api
  - lib/api (OAuth2 and pagination)

The list only includes those courses the requesting user has staff access for.

Facilitates revocation of enrollments in expired modes. XCOM-490.

Sets the Enrollment API free of the modulestore by replacing modulestore queries with calls to the CourseOverview model. Course deletion invalidates the corresponding CourseOverview. XCOM-462.

Changed enrollment api to set enrollment atributes if the course is
credit course

ECOM-1719

Adds standardized audit logging for checkout and enrollment change requests. XCOM-427.

The user parameter corresponds to the username, not the user ID.

- Adding ?include_expired=1 to course detail requests will now include expired course verifications

XCOM-396

A bug with the creation of inactive honor enrollment modes was caught and fixed along the way.

XCOM-388

Will allow Otto to revoke fulfillment of course seat products. Only server-to-server calls are currently allowed to deactivate or otherwise modify existing enrollments.

Also, I replaced a number of tearDown methods with addCleanup instead.
And also remove some unneeded patch.stopall() calls.

Credit modes are hidden by default, since the user
isn't allowed to select them on the track selection page.
This commit exposes credit modes through the enrollment
API so that consumers can see that a course has a credit
track.

And cleaned up one doctoring