Fix to potential data inconsistency bug #187
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* During `LogMgr::sync`, if individual file's flush fails, we should not update `syncedSeqNum` of that file. Otherwise, there can be a risk that the manifest might write that incorrect number in another call stack, and that results in data inconsistency.
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LogMgr::sync, if individual file's flush fails, we should not updatesyncedSeqNumof that file. Otherwise, there can be a risk that the manifest might write that incorrect number in another call stack, and that results in data inconsistency.