Use the course_blocks api to fetch data for date blocks

* fix direct assignment error
* fix byte string error

ARCHBOM-1105

Co-authored-by: Awais Qureshi <awais.qureshi@arbisoft.com>

* Reenable Learning Sequence MFE redirect tests

TNL-7157 These tests may were the cause of intermittent test failures a couple weeks ago. Here they are reenabled after changing the way ExperimentWaffleFlag is overridden.

* Update is_experiment_on and add ExperimentWaffleFlag override test

* Update test_flags.py

* Add docstring about overrides

* prefer is_experiment_on over _is_enabled

Deactivate account 403 error log

ENT-2724 | removed get_cache_key and using it from edx-django-utils.

TNL-7157 These tests may were the cause of intermittent test failures a couple weeks ago. Here they are reenabled after changing the way ExperimentWaffleFlag is overridden.

ENT-2735 | Added the discounted payment message on track selection fo…

add AppConfig for catalog

Unlike the previous commit, this change is suggested by
me, not Learner Support.

* Clarify device requirements.
* Clarify that one's photo does not need to exactly
  match the photo on their ID.
* Clarify why we need the photo.
* Clarify that the ID need not be government issued.

Rewordings were suggested by Learner Support team.

EDUCATOR-5012

Upgrade to Django 2.2

Adds retry logic for software secure

ARCHBOM-1105

Adds in New Relic tracing to Dates view on course_id, user_id, and is_staff

bump edx-enterprise version to 3.0.13

Merge all configs of devstack_docker.py into devstack.py

changed verification email type to html

Auto load any keys/values from the yaml config file.

* Remove waffle switch PREVENT_AUTH_USER_WRITES

During another bug investigation I figured there are some
issues related to showing error messages to learners upon
submission.

PROD-1431