Allow empty order numbers in django admin for Entitlements

Pass back the answer html as a string instead of bytes.

* fix type mismatch in course_goals  migrations

* fix type mismatch in experiments  migrations

* fix type mismatch in xblock_django  migrations

* fix type mismatch in catalog  migrations

* fix type mismatch in static_replace  migrations

* fix type mismatch in bulk_email  migrations

* fix type mismatch in course_overviews migrations

* Fix type mismatches in the course_modes migrations

* Fix type mismatches in the course_action_state migrations

* Fix type mismatches in the schedules migrations

* Fix type mismatches in grades migrations

* Fix type mismatches in video_pipeline

* Fix type mismatches in api_admin

* Fix mismatches in credential migrations

We did this already for the 'get_html' function for a capa problem but
there wasn't a test to ensure this works correctly for the
get_question_answer function that powers the show answer button.

I ran into it while doing a quick smoke test on the python 3 sandbox.

Improve logging against Problem grade report

BOM-947

BOM-946

BOM-951

Added logs to investigate the issue

* Fix type mismatches in track migrations

* Fix type mismatches in oauth_dispatch

* Fix type mismatches in badges migrations

* fix type mismatch in contentserver migrations

* Fix type mismatches in mobile_api migrations

* fix type mismatch in crawlers migrations

* fix type mismatch in dark_lang migrations

* fix type mismatch in branding  migrations

REV-980

Python Requirements Update

certificates: Explicitly Set fields to unicode to avoid migration

lms_xblock: Explicitly Set fields to unicode to avoid migration

waffle_utils: Explicitly Set fields to unicode to avoid migration

Use sphinxcontrib-openapi to do the heavy lifting of Open API rendering.

Updated the assertion make comparison consistent - BOM-960

Refactored enterprise unlink code to fix ENT-1890

changes made to allow non field dictionary comparisons as intended

changes made to fix failure on reading values for dictionaries

updated the comparison operation to make comparison consistent (irrespective of the order of items)

changes made to allow non field dictionary comparisons as intended

changes made to fix failure on reading values for dictionaries

Fixing bytes issue.

Refactored enterprise unlink code to fix ENT-1890

Fixed quality violations and brokent test

Fixed pylint quality violations

Fixed failing unit test

Fixed broken test after rebasing with master

Open a file in read binary mode to avoid bytes issues.

Added management command to populate history from snapshot data.

Make settings regex non greedy.

Change completion API to work with any learning context