* Removing deprecated rest_framework_oauth library

* removing dependecy of django-rest-framework-oauth

* removing oauth_provider from cms

This key used to have underscores and was accidentally changed to not have underscores, setting it back to the old value

This reverts commit f0818544.

This patch would disable Mobile Course Available
UI field in studio's advanced settings based on
DISABLE_MOBILE_COURSE_AVAILABLE flag..

PROD-1243

* MICROBA-149 Create user id tables

* Move to openedx

* Rename app in doc

* Update PII tag

* Update doc

prod-1188

-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

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)

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

[TNL-7043] If vertical block content is in an iframe in the learning microfrontend app, add a base tag in the head (of the iframe document) to force links to navigate the parent window.

PROD-1178

This will remove imports from __future__ that are no longer needed.

https://docs.python.org/3.5/library/2to3.html#2to3fixer-future

Implementation details:
* Anonymous users are assigned a unique ID (like 
  `anon42c08f9996194e2a9339`) which gets stored in the django session.
  `block.scope_ids.user_id` and `block.runtime.anonymous_student_id`
  will both return this value.
* User state for anonymous users is stored in the django cache and
  automatically expires as the cache gets pruned. Because user state is
  stored, anonymous users can use interactive blocks like capa problems.
* There is no mechanism for upgrading to a registered account and
  keeping user state since the user state store for anonymous users
  (EphemeralKeyValueStore) is completely different than the one for
  registered users (DjangoKeyValueStore/"CSM"), and has no "list all
  keys" functionality.
* "User State Summary" field values are shared among [recently active]
  anonymous users but are not shared with registered users.
* Anonymous users can only access the `public_view` of XBlocks, not the
  regular `student_view`.

Ensure that certificate is not generated if a learner enrolled in
audit mode is whitelisted

PROD-978

Add an LMS feature flag to enable courseware search for course staff
only. TNL-6931

EnterpriseMiddleware set value of user's enterprise customer in session. In order to get value of enterprise customer it calls `enterprise/api/v1/enterprise-learner` API. Sometimes this middleware is called many times which result in many call to the under lying API and throttling of API causes 429 http errors.
We are not removing that middleware and storing value of user's enterprise customer in session inside underlying method.
ENT-1849

Removed pdb statement

This patch would make financial
assistance form help message to be
consistent with implementation. Using
characters limit instead of word limit.

PROD-733

- Upgrade edx-drf-extensions to 2.4.5
- Removed constraint to 2.4.0, because 2.4.2 introduces a workaround for
ARCH-1210 by putting the problematic code behind a django setting.
- Remove unused JWT_AUTH_REFRESH_COOKIE setting.

ARCH-418, ARCH-1269, ARCH-1044

fix broken toggle

student: Explicitly Set fields to unicode to avoid migration

We need to do this because when I tride to go to the JSON serializer a
bunch of tests started failing because various parts of our code are
putting things into the session that are not JSON serializable.

We can't keep using the default pickle serializer because it defaluts to
using the highest available protocol and that will cause issues with the
python 2 to 3 upgrade since both will be running in production at the
same time.  We need to use a version of the pickle protocol that both
can use interchangably.

We also need to make sure we read with latin1 encoding to make datetimes
work correctly between the two versions of python.

This will force a logout as sessions fail to load but this should be a
more performant and secure serializer moving forward.  The reason we
overwrote it in our config is that it previously used to be the default
and we didn't want things to breake and force logouts when we changed
it.  We're no more okay with people getting logged out.