* fix type mismatch in third_party_auth migrations
* fix type mismatch in verify_student migrations
* fix type mismatch in video_config migrations
* fix type mismatch in verified_track_content migrations
* fix type mismatch in commercemigrations
* fix type mismatch in xblock_config migrations
* fix type mismatch in course_creators migrations
* fix type mismatch in contentstore migrations
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
We are doing this for two reasons:
1. We suspect that the get_username function in social_core is performing a case-sensitive
username check which is breaking when we try to create the user with a duplicate username.
This version ensures we perform a case insensitive check.
2. If it's not that, we want more logging information in order to debug the issue.
PSA was monolothic, now split, with new features, like
a DB-backed partial pipeline. FB OAuth2 version also upped.
Partial pipelines don't get cleared except when necessary.
They persist for special cases like change of browser while
still mid-pipeline (i.e. email validation step).
Refactor, cleanup, and update of a lot of small things as well.
PLEASE NOTE the new `social_auth_partial` table.
When authenticating using an SAML IdP, gather additional user
data besides what is standard. Requires admin to input JSON
in settings to recognize the additional user data.
The python social auth SAML page returns a 500 response when accessed
without the 'idp' query param. It should redirect to the login page if
the param is missing.
SOL-1550
