add checksum for backup files
Summary: Keep checksum of each backuped file in meta file. When it restores these files, compute their checksum on the fly and compare against what is in the meta file. Fail the restore process if checksum mismatch. Test Plan: unit test Reviewers: haobo, igor, sdong, kailiu Reviewed By: igor CC: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D15381
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