check_ethernet.hook: stop honoring shill-start.lock

All users should have migrated to using
/run/autotest_pause_ethernet_hook, which is a more useful superset of
this lock. Some are using both (for now), but that still means we can
just honor one of them.

BUG=chromium:1018463
TEST=none

Cq-Depend: chromium:1884696
Change-Id: Iaa609485345dc21ea7c4294fb55bd545d90dd3a9
Reviewed-on: https://chromium-review.googlesource.com/1884697
Tested-by: Brian Norris <briannorris@chromium.org>
Commit-Ready: Brian Norris <briannorris@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Matthew Wang <matthewmwang@chromium.org>
1 file changed