Fix to bug on committing logs to be rolled back #57
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* Followers always should commit on received logs only, as leader may send empty payload with the latest committed index. If some logs that the follower currently has are stale so that need to be rolled back, they can be incorrectly committed by this request.
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send empty payload with the latest committed index. If some logs that
the follower currently has are stale so that need to be rolled back,
they can be incorrectly committed by this request.