Merge branch 'testing' of https://github.com/vincentkfu/fio

* 'testing' of https://github.com/vincentkfu/fio:
  t/zbd: improve error handling for test scripts
  testing: use max-jobs to speed up testing
  docs: update cmdprio_percentage with note about root user
  t/latency_percentiles: run cmdprio_percentage tests only if root
  t/run-fio-tests: better catch file errors
  t/jsonplus2csv_test: reduce file size