- use new dates banner template on course outline page
- remove old banner from main.html
- let dates tab use new dates banner template
- remove dates banner completely from the courseware problem view
  on the web app
- use new banner on the courseware problem view on the mobile app
- update banner util to use get_course_blocks

Fixed Import error due to pre tag

* remove old_format reference in teams config

* validate uploaded character values for team csv upload

Co-authored-by: Ben Warzeski <benwarzeski@edX-C02CD0HCLVDM.cable.rcn.com>

AA-164: Performance fixes for course home

* remove old_format from team config tests

* remove old format from teams_config

Co-authored-by: Ben Warzeski <benwarzeski@edX-C02CD0HCLVDM.cable.rcn.com>

This reverts commit 1d7ff32a.

Fixed regex for nested pre tags

Updated import export test

fixed quality test issue

fixed No exception type(s) specified

updated tests

fixed linter issue

fixed linter issue

fixed linter issue

* Commits:
  Add is_staff check to masquerade POST
  Convert masquerade view to class-based

[CRI-174] [BB-2402] Fix LTI issues due to duplicated Content-Length header

AA-115: Adding external API for dates tab

This adds in the API for the Dates Tab for use by the
Course Home MFE.

Cleaned up a few more things about the testing configuration now that we've deployed Django 2.2 to production:

* Go back to a single version of django-oauth-toolkit, tox doesn't need to vary it anymore
* Go back to PyPI release of django-method-override
* Remove no longer needed dependency on python-oauth2 (we already removed the package it was used by)
* Update prepare_xdist_nodes.sh with new Django requirements file options

Remove code from the courseware index page that was only relevant if the shopping cart was enabled.

Restrict api to staff users

Optimization

** This removes some of the extra
   celery calls to credential service for
   updating grade when a certificate is updated.

** This removes extra db calls
   by reusing existing queryset values.

PROD-1363

Update swagger.yaml, fix some markup errors

* fix query to remove dulicates and incorrect teams

importing ENTERPRISE_CUSTOMERS_EXCLUDED_FROM_CATALOG list from settings following same pattern that is used for CORS_ORIGIN_WHITELIST

[AA-139] Record schedule updates to the history table when granting e…

Only the data download tab should appear for data researchers