[HBASE-18037] Do not expose implementation classes to CP - ASF JIRA

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For example, StoreFile. Expose the implementation classes to CP will make it harder to implement new features or improve the old implementation.

1.	Rename StoreFile to HStoreFile and add a StoreFile interface for CP		Resolved	Duo Zhang
2.	Add document about the IA.Private classes which appear in IA.LimitedPrivate interfaces		Resolved	Duo Zhang