Solving possible race condition issues with certain datasets

In some legacy datasets, the same sample can work as a biometric reference and probe. Running distributed experiments might trigger some racing conditions. Since our file system has no file locking mechanism, we might face some random and bizarre bugs. This MR fixes the issue.

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• 6e862353 - Solving possible race condition issues with certain datasets

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enabled an automatic merge when the pipeline for 6e862353 succeeds

merged

mentioned in commit d647dc76

@tiago.pereira couldn't this have been done in the database interface itself?

mentioned in issue bob#269 (closed)