Soft-Index File Store: (local files)-based cache store
- see SoftIndexFileStore javadoc for design info
ISPN-4696 SuspectException kills operation on ClusterRegistryImpl

* Added retry for ClusterRegistry operations
Revert "Revert rebalancing per cache"

This reverts commit 8cbba22ae625c7dd3e8f5ff389b71f4b49aec2b4.