fix potential race condition in rucio object store

Yakubov, Sergeyrequested to merge
154-rucio-download-files-in-a-a-random-folder into dev

Summary of Changes

When multiple jobs are running and downloading the same Rucio file, a race condition might occur since they all write to the same location. Saw that on Perlmutter.

So, we change the location to a random folder to avoid that.

Checklist

  • The MR has a clear and concise title
  • Code is self-documented and follows style guidelines.
  • Automated tests are written and pass successfully.
  • Regression tests (e.g. manually triggered system tests, manual GUI/tool tests, ...) are performed to make sure the MR does not break anything (when applicable)
  • Readme file is present and up-to-date.

Documentation Updates

Additional Notes

Closes #154 (closed)

Edited by Yakubov, Sergey

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