CL here: https://chromium-review.googlesource.com/#/c/chromiumos/third_party/autotest/+/896737

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/1604cd6563a5ac164bde2095002812b12acef6c7

commit 1604cd6563a5ac164bde2095002812b12acef6c7
Author: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Date: Fri Apr 20 07:33:08 2018

plt: ignore virtual ethernet interfaces

Recently, a couple of PLT runs have been lost due to PLT
perceing veth_android to be a real ethernet interface.
This changes the condition to checking if the interface name starts with eth
to differentiate between 'real' wired connections like eth0 and virtual
ones like veth_android.

BUG= chromium:807940 
TEST=manual,
run PLT with veth_android up, and no complaints

Change-Id: Ia0f3029f19be8de86b7fb9c1149e35d549ba8779
Reviewed-on: https://chromium-review.googlesource.com/896737
Commit-Ready: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Tested-by: Ruben Rodriguez Buchillon <coconutruben@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>

[modify] https://crrev.com/1604cd6563a5ac164bde2095002812b12acef6c7/client/site_tests/power_LoadTest/power_LoadTest.py