let bundle plugin select symbolic name according to convention, select hibernate ehcache bundle os vs ee

git-svn-id: http://svn.terracotta.org/svn/ehcache@7708 b9324663-ca0f-0410-8574-be9b3887307d
merge 7708 from trunk/ehcache-os 

git-svn-id: http://svn.terracotta.org/svn/ehcache@7709 b9324663-ca0f-0410-8574-be9b3887307d