Merge pull request #1845 from raydavis/qawip

QA CLC-2884 Deal with non-array values of uid in RegStatus
CLC-2883 Separate on-demand from hotplate warmups
CLC-2883 Fix method call
CLC-2883 Fix stats recording
CLC-2883 Switch from HotPlate to LiveUpdatesWarmer in cache settings
Merge pull request #1849 from ctweney/clc-2883-qa

CLC-2883 (QA) Separate HotPlate scheduled runs from on-demand warmups
CLC-2891 - Fix the _picker_shown error
https://jira.media.berkeley.edu/jira/browse/CLC-2891