Delete ehcache-2.8.4 tag to retag.

git-svn-id: http://svn.terracotta.org/svn/ehcache@9204 b9324663-ca0f-0410-8574-be9b3887307d
Tag ehcache-2.8.4 from 4.1.4-rc branch

git-svn-id: http://svn.terracotta.org/svn/ehcache@9205 b9324663-ca0f-0410-8574-be9b3887307d