TABQA-7431: fix event registration in nonstop caches

git-svn-id: http://svn.terracotta.org/svn/ehcache@9085 b9324663-ca0f-0410-8574-be9b3887307d
TABQA-7431: notify event listeners when cache is cleared via management

git-svn-id: http://svn.terracotta.org/svn/ehcache@9086 b9324663-ca0f-0410-8574-be9b3887307d