OBMFULL-5353 Add default EhCache memory configuration (statsSampleToRecordCount shouldn't be exposed)
OBMFULL-5353 Die if migration of a cache didn't succeed, add tests
OBMFULL-5353 Migration remove datas only when the shutdown succeed, review
OBMFULL-5353 Restore and repare a failing test
OBMFULL-5353 Use another cache manager target for migration, review