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

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

API docs are now always available, no more toggle to enable them.

We are currently running this plugin from a has directly off of master
to get support for a newer version of DJDT.  However even on master
there is not yet support for python 3.  We're running into this when
running runserver and when collecting static assets.

A quick survey of the development team at edX shows that people are no
longer actively using this debug panel.(14 responders all saying no to
the question "In the last year have you used the mongo portion of the
django-debug-toolbar in edx-platform?")

This makes sense since the module store and courseware related
developement is not very active right now.  Given all this, I'm removing
this toolbar for now and if we need it again we can survey what's
available at that time to choose the best tool.

https://github.com/edx/edx-platform/pull/20645

This introduces:
* A new XBlock runtime that can read and write XBlocks that are persisted using
  Blockstore instead of Modulestore. The new runtime is currently isolated so
  that it can be tested without risk to the current courseware/runtime.
* Content Libraries v2, which store XBlocks in Blockstore not modulestore
* An API Client for Blockstore
* "Learning Context" plugin API. A learning context is a more abstract concept
  than a course; it's a collection of XBlocks that serves some learning purpose.

remove social auth users command

Currently, the LMS logout endpoint should iframe in the logout pages of
all the IDAs you were logged into. In short, this was made possible with
DOP because keeping track of the logout URIs and leaving a trail of
evidence in the user cookies was part of what we added in our fork of
DOP.  In the case of DOT, we don't have time or desire to fork DOT to
mirror this behavior, so our stop-gap solution is to log out the user
from a list of logout URIs in settings.

This is a feature that has been deprecated and can be safely removed.

DEPR-7

relied on the old configuration values and old way of validating
passwords. Also improved registration page by always showing error
messages rather than hiding them on leaving the field.

the old validate password method and configuration values in favor of
AUTH_PASSWORD_VALIDATORS, a list of validators to use to check a
password. These include some that come straight from Django and some
that were written according to Django's specifications. This work also
included maintaining the current messaging as instruction text and
passing along restrictions for the password field.

Use LOGIN_REDIRECT_WHITELIST to provide a whitelist of
additional domains to which login will now redirect.

ARCH-238

This reverts commit a0224618.

Reverts edx/edx-platform#17486

The LMS and edx-enterprise currently communicate via REST APIs, even
though they are all running within the same service.

Currently API URLs are constructed using LMS_ROOT_URL, but that is
problematic on some systems where the external LMS_ROOT_URL is not
accessible from the private network, or routing internal requests via
the external URL is not desireable.

This patch introduces a new setting variable LMS_INTERNAL_ROOT_URL which
defaults to the value of LMS_ROOT_URL for backwards compatibility.

The LMS and edx-enterprise will use LMS_INTERNAL_ROOT_URL to construct
API URLs instead of LMS_ROOT_URL.

New management command for setting up a test environment. The command creates a ScheduleConfig and schedules if they don't exist (the schedule starts three days before the time the command is run). If a schedule already exists, the command updates the schedule's start time and upgrade deadline. The values set by the command will allow send_recurring_nudge to send three-day nudges.

EDUCATOR-1448

Modifies paver webpack task to use production configuration in all
non-devstack environments, and a development config in devstack.