ENG-590 Integration test for clustered cache manager destroy

git-svn-id: http://svn.terracotta.org/svn/ehcache@8428 b9324663-ca0f-0410-8574-be9b3887307d
cut out some dead code for custom/DSO mode

git-svn-id: http://svn.terracotta.org/svn/ehcache@8429 b9324663-ca0f-0410-8574-be9b3887307d