Remote connection should not fail on failed ping by default

The purpose of the ping check is to speed up failure in the
interactive case ("cros flash" and "cros deploy" for instance)
but it can be damaging in a test lab environment, where
packet losses can be more common and need to be tolerated
better.  So do not use the ping check by default.

BUG=chromium:683304
TEST=ran cros flash with disconnected ethernet, verified error is still "device not pingable"

Change-Id: Ie4dcd53c01428cff51ef3dd43acb64e9a0a3b1aa
Reviewed-on: https://chromium-review.googlesource.com/433389
Commit-Ready: Luigi Semenzato <semenzato@chromium.org>
Tested-by: Luigi Semenzato <semenzato@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed