tree 4a2cf13f3c7a06385c6b11d7d3841b6643cffd1d
parent ac5adecc965df1831836aae7e92e3e345669eff5
author Laurence Goodby <lgoodby@google.com> 1524869029 -0700
committer chrome-bot <chrome-bot@chromium.org> 1525839342 -0700

check_ethernet: add fallback to any recently seen neighbor

Jetstream mesh devices do not have a default gateway before
the mesh is established. This was causing the check_ethernet
hook to fail if there was no active SSH connection to the DUT.

This adds a fallback to ping any recently seen neighbor.

BUG=b:74075854
TEST=Checked fallback on devices with no default gateway and no
  active ssh connection.

Change-Id: I36f416e10d9d5e0f2db71c9b67210ea210b184c6
Reviewed-on: https://chromium-review.googlesource.com/1033999
Commit-Ready: Laurence Goodby <lgoodby@chromium.org>
Tested-by: Laurence Goodby <lgoodby@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>