fixed missing slf4j bundle

git-svn-id: http://svn.terracotta.org/svn/ehcache@9190 b9324663-ca0f-0410-8574-be9b3887307d
merge 9190 from trunk/ehcache-os 

git-svn-id: http://svn.terracotta.org/svn/ehcache@9191 b9324663-ca0f-0410-8574-be9b3887307d