This reverts commit fe1ba18dfc.
Reason: break import
<!--
If you know who should review your pull request, please assign it to
that
person, otherwise the pull request would get assigned randomly.
If your pull request is for a specific language, please add the
appropriate
lang label.
-->
This helps developers run benchmark loadtests locally. See comments in
scenario_runner.py for usage.
---------
Co-authored-by: drfloob <drfloob@users.noreply.github.com>