[CLC-3168] QA: verify expected behavior when textbook feed is unavailable
Merge remote-tracking branch 'ets/master' into CLC-3168
Merge pull request #2063 from haroonrasheed333/CLC-3168

[CLC-3168] QA: verify expected behavior when textbook feed is unavailable
CLC-3186: LiveUpdates: Start doing warmups earlier

https://jira.media.berkeley.edu/jira/browse/CLC-3186

Start doing warmups earlier.
Trigger warmup from BootstrapController as soon as we know we have a valid session[:user_id]