Run stress tests on >=ToT-2 releases nightly.

Changed the suite scheduler to run stress tests on >=ToT-2. Devices
usually FSI on releases older than ToT, and we need this data for
generating relevant stress lab reports.

BUG=None
TEST=None

Change-Id: If457f114e34e513ad1f01d641bda57a8aabe826a
Reviewed-on: https://chromium-review.googlesource.com/258980
Reviewed-by: Kris Rambish <krisr@chromium.org>
Commit-Queue: Yusuf Mohsinally <mohsinally@chromium.org>
Tested-by: Yusuf Mohsinally <mohsinally@chromium.org>
1 file changed