ISPN-4681 Preloading from shared cachestore on a new node with non-share...

...d index is skipping indexing

https://issues.jboss.org/browse/ISPN-4681

This should solve ISPN-4048 and ISPN-4595 as well;  what it does is avoid indexing during preload in all cases except if we know for sure the index is not shareable (only ram falls into this category)
yep! Will update the PR