Use guest login for DUT test environment.

Guest login does not own TPM; while test user login will own TPM and
cause problem to verify_tpm in finalize.

Fixed a conflict in py/goofy/goofy.py so we keep one-pixel-less in
this branch.

BUG=chrome-os-partner:22050
TEST=make lint test
TEST=manually on my DUT

Change-Id: I66478977fd95b41278e559f0b03e4f183a0b4e7b
Reviewed-on: https://chromium-review.googlesource.com/171700
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/181611
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
3 files changed