Add butterfly to the waterfall for BVT HW_Test.

BUG=None
TEST=cbuildbot_config_unittest.py

Change-Id: I46d4e84b0626ac1f532e4ba55528e2babf70c44a
Reviewed-on: https://gerrit.chromium.org/gerrit/42311
Tested-by: Scott Zawalski <scottz@chromium.org>
Reviewed-by: Dennis Jeffrey <dennisjeffrey@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Queue: Scott Zawalski <scottz@chromium.org>
1 file changed