MNK-5436 : IBM J9 is more eager about classloading than Hotspot, have to have more classes available

git-svn-id: http://svn.terracotta.org/svn/ehcache@7983 b9324663-ca0f-0410-8574-be9b3887307d
MNK-5464 : rework this CacheWriter test in a new more robust style as a test case before reworking the whole class

git-svn-id: http://svn.terracotta.org/svn/ehcache@7984 b9324663-ca0f-0410-8574-be9b3887307d
MNK-5464 : merge 7984 from 2.8.x

git-svn-id: http://svn.terracotta.org/svn/ehcache@7985 b9324663-ca0f-0410-8574-be9b3887307d
MNK-5464 : merge 7984 from 2.8.x

git-svn-id: http://svn.terracotta.org/svn/ehcache@7986 b9324663-ca0f-0410-8574-be9b3887307d