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Add the GatewayCanBePinged routine to the ServiceConnection.

BUG=chromium:956783
TEST=1) chromeos_unittests --gtest_filter=CrosHealthdServiceConnectionTest.*
2) Applied GatewayCanBePinged changes and successfully ran the
GatewayCanBePinged routine on a DUT (verified using cros-health-tool diag
--action=run_routine --routine=gateway_can_be_pinged).

Change-Id: I942ead41313756f84a9b717809390809f6f331f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2344648Reviewed-by: Paul Moy <pmoy@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Commit-Queue: Kartik Hegde <khegde@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816787}