Upgrade pymongo
LMS-11437
Test multiple threads linear growth
Remove unused credentials from mongo init
was breaking pymongo 2.7
tz aware
Make unit tests work on older mongo versions
Merge pull request #5288 from edx/split/info_perf

Upgrade pymongo
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.