[autotest] Block atest/run_suite from being ran as root user.

If these scripts run as root on MobLab, they leave files in
the autotest directory that user moblab can't open or delete,
and the autotest services will begin to fail. Usually a user
would have to powerwash if they got to this state, hence
lets stop these scripts from being ran as root at all.

BUG=chromium:391138
TEST=sudo python run_suite.py fails.

Change-Id: I341b0d38f211809eeafc174ef709a7b71ea87b64
Reviewed-on: https://chromium-review.googlesource.com/316448
Commit-Ready: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Kevin Cheng <kevcheng@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
4 files changed