SHINDIG-1931 | EhCache provider always uses a singleton cache manager, even if it is the wrong one | Backporting from trunk to the 2.5.0-update branch.

git-svn-id: https://svn.apache.org/repos/asf/shindig/branches/2.5.0-updateX@1520764 13f79535-47bb-0310-9956-ffa450edef68