A more restricted interface for HStore. Only gives the caller access to information
about store configuration/settings that cannot easily be obtained from XML config object.
Example user would be CompactionPolicy that doesn't need entire (H)Store, only this.
Add things here as needed.
Gets the Memstore flush size for the region that this store works with.
Gets the cf-specific time-to-live for store files.
Gets the cf-specific compaction check frequency multiplier.
The need for compaction (outside of normal checks during flush, open, etc.) will
be ascertained every multiplier * HConstants.THREAD_WAKE_FREQUENCY milliseconds.
The number of files required before flushes for this store will be blocked.