CLC-4276 - Expire cache on /api/my/status when opting in / out of the calendar option

https://jira.ets.berkeley.edu/jira/browse/CLC-4276

@ctweney should probably have a look at this before merging.
Merge pull request #2966 from christianv/CLC-4276b

CLC-4276 - Expire cache on /api/my/status when opting in / out of the calendar option