support disabling checksum in block-based table
Summary: store a zero as the checksum when disabled since it's easier to keep block trailer a fixed length. Closes https://github.com/facebook/rocksdb/pull/2781 Differential Revision: D5694702 Pulled By: ajkr fbshipit-source-id: 69cea9da415778ba2b600dfd9d0dfc8cb5188ecd
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