-Updated middleware setting to use use middleware insted of
middleware_classes
-github install of django-method-override fork to support
new style middleware in django1.11

Add relative dates waffle flag

Specifically, course_experience.relative_dates. This will be used
by future PRs to control our rollout of this new feature.

AA-27

Relates to TNL-7048. Since bookmarking is handled in the courseware microfrontend, it needs to also manage the display of a unit title.

Revert commits for AA-4

BOM-939 Update pickle procotol version.

These settings are used to toggle new authentication class in discussion and bookmarks app. The auth class is in openedx/core/lib/api/authentication.py and was added to replace deprecated OAuth2Authentication class in [rest_framework_oauth library](https://github.com/jpadilla/django-rest-framework-oauth)

AA-4: Be more defensive about not finding an item in modulestore

Python upgrades (django-config-models v2)+

ENT-2511 | Disabled the admin panel's login page.

PROD-1236: Change URL returned for generated certificates to use UUID.

ENT-2269: Added ability to logout from IDP when logout flow is triggered from learner portal

add multiple correct values check for Dropdown problems

Choose max of course start or enrollment created date when
schedule start date is in the past

PROD-1198

Some tests that used to mock the cache internals of ConfigurationModels
had to be modified to use CacheIsolationTestCase instead (the things
they were mocking no longer exist).

AA-4: CSS updates in date widget

Python Requirements Update

Show relevant dates in course dates sidebar

PROD-1236: Change URL returned for generated certificates to use UUID, for consistency across api calls.

Logout link should be displayed only for learner portal

Added changed to display only for learner portal
Added unit tests

check third_party_auth is enabled

Changes to extend SSO logout link feature to Oauth providers

Fixed quality violations

Removed unncessary assert

Reviewer feedback changes

Fixing deprecated django-filter features

Updating to the current highest number instead of making it the default
which is highest know by the language.  This is beacuse when we update
between python versions if there is a new proctocol version, we don't
want that to cause cache thrashing as we try to load things from the
various caches.  We can get into a situation where new machines pickle
things with a newer versions of the procotocl, put them in the cache and
then break older machines that don't know about the new protocol
version.

This includes (at least) upcoming assignments, FBE access
expiration, and course end date.

AA-4

Update requirements

* wip

* get

* quality

* change oauth2 to deprecated?

* quality

* remove duplicate enrollment check function

* code review

Add toggle to remove access to DOP code paths.

Fix constraints to not have a lingering pin on edx-when. And
add constraint on version of mock that supports python 3.5.

And then a general make upgrade.

Add course_date_signals to INSTALLED_APPS