Added iperf and netperf to DUTs, cleaned modems BUG=chromium:272493 TEST=run_all_tests.py Change-Id: Iec34502f4a8b8cfec2cac8458350556566710b4b Reviewed-on: https://chromium-review.googlesource.com/182871 Reviewed-by: Ben Chan <benchan@chromium.org> Tested-by: Byron Kubert <byronk@chromium.org> Commit-Queue: Byron Kubert <byronk@chromium.org>