toolchain-utils: Generate more detailed logs for nightly tests

By default the logs of nightly tests do not show details about how
certain tests fail. This patch increases the logging level of nightly
performance test to 'verbose' explicitly and it will help people
debug errors.

BUG=chromium:1063703
TEST=None

Change-Id: I1f3889a9816fee1172291310964505a8f5468cb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2117639
Commit-Queue: Zhizhou Yang <zhizhouy@google.com>
Tested-by: Zhizhou Yang <zhizhouy@google.com>
Auto-Submit: Zhizhou Yang <zhizhouy@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
1 file changed