SoftIndexFileStore has been improved to support segmentation and no longer utilize many extra threads.
We should now be able to make SoftIndexFileStore the file store in Infinispan. This means doing a few different things:
1. Move SoftIndexFileStore to core
2. Deprecate SingleFileStore and move to single-file-store
3. Add in migration code from SFS to SIFS upon startup
4. Change our internal references to keep using SFS when acceptable