TempestJobs failing with "invalid option"

Attempting to run a TempestJob on current devel will lead to failing Tempest job pods that only print a single error line in their logs:

/run_tempest.sh: invalid option

The root cause seems to be a change introduced in the Tempest image: yaook/images/tempest@bb44f347

The run_tempest.sh script will try to parse a new --concurrency flag but will crash with "invalid option" for anything that is not --concurrency, --help or a verbatim --.

This clashes with the way that the operator assembles the Tempest job container's run command in yaook/op/tempest/templates/template-tempest-job.yaml#L19-30 which passes things like run or --serial directly to it.