BackupEngine gluster-friendly file naming convention
Summary: Use the rsync tempfile naming convention in our `BackupEngine`. The temp file follows the format, `.<filename>.<suffix>`, which is later renamed to `<filename>`. We fix `tmp` as the `<suffix>` as we don't need to use random bytes for now. The benefit is gluster treats this tempfile naming convention specially and applies hashing only to `<filename>`, so the file won't need to be linked or moved when it's renamed. Our gluster team suggested this will make things operationally easier. Closes https://github.com/facebook/rocksdb/pull/3463 Differential Revision: D6893333 Pulled By: ajkr fbshipit-source-id: fd7622978f4b2487fce33cde40dd3124f16bcaa8
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