SAK-26058 removing the unused caches which use JSR-107 incompatible mechanisms



git-svn-id: https://source.sakaiproject.org/svn/assignment/trunk@307900 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-26058 removing the unused CacheRefresher code

git-svn-id: https://source.sakaiproject.org/svn/assignment/trunk@307901 66ffb92e-73f9-0310-93c1-f5514f145a0a