dut-console: Call cu with stdbuf -oL

Removes some weirdness and double Connected/Disconnected print-outs
when the console exits.

BUG=none
TEST=dut-control cpu

Change-Id: I5e3cdad0baabc14214f1157c8227409a1a1e06a7
Reviewed-on: https://chromium-review.googlesource.com/1195343
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
1 file changed