trunks: Add the trunks user and group
This CL creates the trunks user and groups.
It also adds trunks to the TSS group, so that it
can talk to the TPM.
BUG=chromium:372012
TEST=Ran build_packages, build_image and cros flash to a new DUT
then checked if trunks user and groups were present in the DUT
CQ-DEPEND=CL:214228
Change-Id: I4c5d1bbb4a60caa2282003f47ea7755bf3128f5c
Reviewed-on: https://chromium-review.googlesource.com/214025
Reviewed-by: Utkarsh Sanghi <usanghi@chromium.org>
Commit-Queue: Utkarsh Sanghi <usanghi@chromium.org>
Tested-by: Utkarsh Sanghi <usanghi@chromium.org>
3 files changed
