Add checksumming for ledger index files
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Key: BOOKKEEPER-164
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-164
Project: Bookkeeper
Issue Type: Improvement
Components: bookkeeper-server
Affects Versions: 4.0.0
Reporter: Sijie Guo
now bookie ledger index files lacks checksumming to prevent
truncation/corruption. if a ledger index file is truncated, the ledger index
file still works but responds wrong response when reading last confirmed.
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