ISPN-5002 Add alias for ISPN core modules to satisfy Hibernate Search module dependency
ISPN-5001 NPE on preload with tx caches containing DeltaAware values
Implement purgeOnJoin

The joiner will still do the preload, but the entries will be removed from
the data container.

Also includes a fix for ISPN-3217 (entries not written to the cache store
on a backup owner with CACHE_MODE_LOCAL).

A hack was needed to avoid triggering ISPN-3443 (state transfer undoing the
remove operations).