Use ddt for shib tests
Remove test cleanups

Since `ddt` should make them unnecessary
Add _get_request_value to safely access request.REQUEST for browser events.
Merge pull request #5111 from edx/shib-tests-ddt

Use ddt for shib tests
Merge pull request #5478 from edx/brian/fix-user-track

Add _get_request_value to safely access request.REQUEST for browser events.
Overview and configuration for cohorts feature
Merge pull request #5327 from edx/ahodges/doc/cohorts

Ahodges/doc/cohorts
add Solano CI.
Merge PR#3. Solano: Add post worker hook for copying artifacts.
fixed capturing screenshots
adding post worker script
fixing file log error
introduce bok-choy shards, new firefox version
re-shard lms to fix a failing test.
Add quality report capability.