Ignore OSError in devserver

psutil does not work properly in builder. The load info of devserver has no
use in devserver anyway. Ignore such error when importing psutil.

TEST=local run devserver
curl http://localhost:8082/check_health

Change-Id: I29116b2d44c72fea276782b45d949b1005c034d9
Reviewed-on: https://chromium-review.googlesource.com/276247
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
Trybot-Ready: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
1 file changed