[Improve] Repeated defer ledger lock release.

[hanmz]

Motivation

Method underreplicationManager.releaseUnderreplicatedLedger(ledgerIdToReplicate) has call in method logBKExceptionAndReleaseLedger(e, ledgerIdToReplicate), so we not need execute underreplicationManager.releaseUnderreplicatedLedger(ledgerIdToReplicate) in finally.

Changes

Set deferLedgerLockRelease is true after execute logBKExceptionAndReleaseLedger(e, ledgerIdToReplicate).