Add max key/value size for binlog_tool to prevent OOM#468
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binlog_tool在解析binlog文件时默认不对key size和value size进行限制，完全信任binlog中的key/value size字段，若存在特殊的binlog文件，其中修改了key/value size字段导致binlog_tool解析失败，存在OOM的风险。
现添加
--max-key-size和--max-value-size参数用于限制允许的最长key value的长度，阻止OOM的可能。