Course-access-groups

~~~~~~~~~~~~~~~~~~~~
* Minor fix for a False-Positive log

~~~~~~~~~~~~~~~~~~~~

* Use tahoe-sites v0.1.2 and refactor related code:
* Bump django from 2.2.26 to 2.2.27
* Bump pillow from 9.0.0 to 9.0.1
* Bump django from 2.2.27 to 2.2.28
* Bump lxml from 4.6.2 to 4.9.1
* Added tests for modifying membership rule.
* Fixed documentation for modifying the membership rule.

~~~~~~~~~~~~~~~~~~~~

* Bump pillow from 7.2.0 to 9.0.0
* Bump django from 2.2.25 to 2.2.26
* Fix ValueError for inactive users' REGISTER_USER singal

~~~~~~~~~~~~~~~~~~~~

* Bump pillow from 7.2.0 to 8.3.2
* Bump sqlparse from 0.4.1 to 0.4.2
* Tests and docs fixes for membership rule PATCH
* style doc fix for MembershipRule API
* Bump lxml from 4.6.2 to 4.6.5
* Bump django from 2.2.24 to 2.2.25
* add organization_uuid parameter for superusers

~~~~~~~~~~~~~~~~~~~~

Added
_____

* log exceptions for the USER_ACCOUNT_ACTIVATED signal

~~~~~~~~~~~~~~~~~~~~

Added
_____

* Fixes for Django 2.x

Removed
_______

* Dropped support for Python 2.x and Django 1.x