Fix rucio.cfg file permissions

Duggan, Johnrequested to merge
145-fix-rucio-cfg-file-permissions into dev

Summary of Changes

This sets the permissions of the rucio.cfg file. This is currently deployed to the test pulsar nodes, so if you can ingest a data file from the analysis cluster then it should be working.

I also made the client tests run serially as I noticed they were failing when I created my branch. It seems to fix the issue, but I didn't look too deeply into it.

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 #145 (closed)

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