hdctools: servo: Silent EC console to prevent accidental failure

We communicate with EC using EC console. However, there is much noise in
EC console. Let's silent all other EC console channel before we
communicate with EC to prevent accidental failure.

BUG=chrome-os-partner:10945
TEST='dut-control cpu_temp dev_mode' still works

Change-Id: I4397339767baa1c72ace8d28139f83787de202ed
Reviewed-on: https://gerrit.chromium.org/gerrit/26308
Reviewed-by: Vic Yang <victoryang@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>
Commit-Ready: Vic Yang <victoryang@chromium.org>
1 file changed