SAK-26059 removed all the caching (it was always disabled anyway)

git-svn-id: https://source.sakaiproject.org/svn/calendar/trunk@307924 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-26059 removed the cacherefresher (separate in case we need it in the future)

git-svn-id: https://source.sakaiproject.org/svn/calendar/trunk@307925 66ffb92e-73f9-0310-93c1-f5514f145a0a