DorianZheng f5e46354d2 Protect external file when ingesting ()
Summary:
If crash happen after a hard link established, Recover function may reuse the file number that has already assigned to the internal file, and this will overwrite the external file. To protect the external file, we have to make sure the file number will never being reused.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/4099

Differential Revision: D9034092

Pulled By: riversand963

fbshipit-source-id: 3f1a737440b86aa2ef01673e5013aacbb7c33e28
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