[autotest] Add netifaces package to external packages

It's needed for lxc to get the IP address used by lxcbr0.

BUG=chromium:453624
TEST=./utils/test_importer.py
confirm netifaces package is installed in site-packages

Change-Id: Ic0c852b2be1e82448746cb6de0ded9c1f6f7c47e
Reviewed-on: https://chromium-review.googlesource.com/261380
Trybot-Ready: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
1 file changed