This makes it possible to directly request testing noturbofan_stress on the command line.

BUG=chromium:682617
TBR=mstarzinger@chromium.org,mvstanton@chromium.org,rmcilroy@chromium.org
NOTRY=true

Change-Id: I6ba9a022c4ef24fb5abe6878d3f2f972e8461eb8
Reviewed-on: https://chromium-review.googlesource.com/453180
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43748}