ENG-490 Adapt to changes in ClusteredCache

git-svn-id: http://svn.terracotta.org/svn/ehcache@8384 b9324663-ca0f-0410-8574-be9b3887307d
ENG-571 Use locking for ClusteredCache creation

git-svn-id: http://svn.terracotta.org/svn/ehcache@8385 b9324663-ca0f-0410-8574-be9b3887307d