Delete ehcache-2.7.4 tag to retag.

git-svn-id: http://svn.terracotta.org/svn/ehcache@8154 b9324663-ca0f-0410-8574-be9b3887307d
Tag ehcache-2.7.4 from 4.0.4-rc branch

git-svn-id: http://svn.terracotta.org/svn/ehcache@8155 b9324663-ca0f-0410-8574-be9b3887307d