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Running lsusb (to get iSerial) and openocd requires a privilege. This patch makes cts.py run these commands as a root. Opening ttyACM0 requires a privilege as well but it'll be done by asking a user to add themselves to dialout group. BUG=chromium:664309 BRANCH=none TEST=Run cts.py on a freshly set up cros_sdk chroot. Change-Id: Ib9d007459c4b1322b15f521a5253d833e2304c3c Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/558804 Reviewed-by: Randall Spangler <rspangler@chromium.org>