-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

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

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

* reword INCR-483: Make compatible with Python 3.x without breaking Python 2.7 support

pick INCR-483: Re-run isort for lms/envs/test.py

INCR-483: change import order

INCR-483: PyLint fixes

* INCR-483: Fixes useless suppression

* INCR-483: Remove unused get_swagger_view

This reverts commit a0224618.

Reverts edx/edx-platform#17486

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

it's already implied that you're using load testing settings.