KNL-1272 Initial tweaks to make it easier to add other caching implementations



git-svn-id: https://source.sakaiproject.org/svn/kernel@310369 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1272 fixed up dependencies for ehcache and TC + added HC



git-svn-id: https://source.sakaiproject.org/svn/kernel@310388 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1272 Adding first implementations of the hazelcast memoryservice and cache



git-svn-id: https://source.sakaiproject.org/svn/kernel@310398 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-26567 - Disable Portal Chat in 10


git-svn-id: https://source.sakaiproject.org/svn/kernel@310408 66ffb92e-73f9-0310-93c1-f5514f145a0a