Bug 1091453 - [Calendar] fix intermittent failures related to db.connection and DayObserver
Merge pull request #25775 from millermedeiros/1091453-intermittent-single-day

Bug 1091453 - [Calendar] intermittent failure on day observer and single day unit tests r=asutherland
Bug 1091484 - Disable intermittently failing test. r=me