By default, disable all caching in tests, to preserve test independence.
In order to enable caching, inherit from CacheSetupMixin, and specify
which cache configuration is needed.

[EV-32]

The JWT includes the user email and username, along with details pulled from the original access token (e.g. scope, expiration).

ECOM-4221

The JWT includes the user email and username, along with details pulled from the original access token (e.g. scope, expiration).

ECOM-4221

MA-2258

Because this migration depends on enrollment code and that code relies on a new table.

MA-2258

Without this, when CCX runs 0003 it'll invoke course_overviews while
loading a course, but that table has a model change, and the migration
has not run yet.  This ensures the course_overviews migration happens
first.

Added validation to ccx create form, If ccxcon url is set then app will ask user to create ccx from ccxcon app

This reverts commit acf6c1d6, reversing
changes made to c59db6e5.

Wrap whole test with several publish/unpublish in same bulk_op.

This abstract class contains most of the fields (aside from the id and
foreign key to StudentModule that the subclasses need to manage).  It
also provides a get_history method that abstracts searching across
multiple backends.

Move router code to openedx/core
We need to use it from cms and lms.
Ensure aws_migrate can be used for migrating both the lms and cms.

Handle queries directed to student_module_history vs default and the
extra queries generated by Django 1.8 (SAVEPOINTS, etc).

Additionally, flag testing classes as multi_db so that Django will
flush the non-default database between unit tests.

Further decouple the foreignkey relation between csm and csmhe

When calling StudentModule().delete() Django will try to delete CSMHE
objects, but naively does so in the database, not by consulting the
database router.

Instead, we disable django cascading deletes and listen for post_delete
signals and clean up CSMHE by hand.

Add feature flags for CSMHE
One to turn it on/off so we can control the deploy.
The other will control whether or not we read from two database tables
or one when searching.

Update tests to explicitly use this get_history method rather than
looking directly into StudentModuleHistory or
StudentModuleHistoryExtended.

Inform lettuce to avoid the coursewarehistoryextended app

Otherwise it fails when it can't find features/ in that app.

Add Pg support, this is not tested automatically.

This is a clone (copy) of CSMH's declaration and methods with an added
id of UnsignedBigInAutoField

We should be able to delete the save_history code, but needs testing.

Add error logging when capa failures happen

Put StudentModuleHistory into its own database

Bump out the primary key on CSMHE

This gives us a gap to backfill as needed.
Since the new table's pk is an unsigned bigint, even for people who don't
consolidate CSMH into CSMHE, the lost rows are unlikely to matter.

Remove StudentModuleHistory cleaner

REST APIs modified

Modified how the per object permissions are enforced in the CCX REST APIs

Revert "Added staff role on ccx to staff of master course and added a data migration for existing ccx courses."

This reverts commit 91bf48fc.

Before it was depending on the order of results, which is not very consistent.  Now we use known identifiers to delve through data before making our assertions.

Added staff role on ccx to staff of master course and added a data migration for existing ccx courses.

We added the ability here to check if a role has a user in with the ability to refresh the role cache before checking.  Since some tests will make inline requests, which in turn put a user into a new role, we have to refresh afterwards otherwise we won't see that new role in place.  Since we don't want to automatically refresh ever, we just added a way to request it, since we know in this test that we're doing something, effectively, out-of-band, which necessitates it.

CCX REST APIs
OAUTH2 authorization for CCX APIs
- oauth2 authorization required for ccx list.
- Course-instructor permission for ccx api endpoint
- Protection for detail view too.

Tests for CCX REST APIs and OAUTH2 authorization

CCX overrides course max_student_enrollments_allowed
and set it to 200 during CCX creation

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