add static links re-write for demnadhint tag

[PROD-1287] - Optimize problem_grade_report code - FIX.

Revert "Added logs for investigation"

* Expose team management file input for better a11y
* Disable upload button when file not selected

...and it turns out we don't need the switch anymore, anyway.

When we upgraded to Django 1.11, this flag was added in order to
allow for a database migration that would render the user table
unwriteable for up to half an hour:
https://github.com/edx/edx-platform/pull/17561

This involved swapping out the signal handler for logins via
`user_logged_in.disconnect(django_update_last_login)`, but with
Django 2.0, that disconnect is silently failing (returning
false). Likely the disconnect is now happening too soon.
(See edx-platform/common/djangoapps/student/apps.py line 21 in 61e1eda2.)

The result is that by the time the waffle switch is consulted, the
normal handler has already run, and the user's last login date has
already been updated.

For now we're just removing the test, and have filed ARCHBOM-1084 for
followup (deleting the switch and related code).

Bump edx-when to 1.1.4 (perf fix)

Fixing management command.

Django PR removed force_str method: https://github.com/django/django/commit/dc8834cad41aa407f402dc54788df3cd37ab3e22#diff-55346957c9b0473492d19a390a7adb47L36

None is not working now.

TNL-7092 Properly include video javascripts for the video public view

Revert "[PROD-1287] - initial work to optimise problem_grade_report code."

Background: I use private.py a lot in my devstack for my private configurations. But issues are raised when I need to change/override a setting that is defined in devstack_docker.py file. Since that file's contents are loaded after private.py, my private.py is useless against the settings in devstack_docker.py.

Description: Now that the devstack is dockerized, I think it makes more sense to import the private.py in the devstack_docker.py files i.e. at the end of configuration files hierarchy.

BOM-1420 : Fix Django 2.x tests in Discussion app

[PROD-1287] - initial work to optimise problem_grade_report code.

The collect process was broken before this commit because Studio's
runtime does not permit handler_url invocation on "thirdparty"
XBlocks.

PROD-1393

Fixed template engine error under Django 2 - BOM-1416

Add xblock.v1 and xmodule.v1 entrypoints for NonStaffErrorDescriptor

Added an email search parameter to accounts

Upgrade uses renamed enterprise catalog endpoints

Fixed \n escape issue in import-export

Added logs for investigation

Fixed comparison mismatch

updated test

updated test

Make upgrade to get the latest edx-when (1.1.3)

Also pinned httpretty < 1.0 because that upgrade broke many tests.

Unpin edx-when