eclass: profiles: accounts: Add `attestation` user and group

Attestation should be able to talk to the TSS via tcsd.

BUG=chromium:348650
TEST=See CL:191727
CQ-DEPEND=CL:191756, CL:191755

Change-Id: I9c7d84385d5396056e5bf9a6e5d6b3eb3e5d2ae7
Reviewed-on: https://chromium-review.googlesource.com/191754
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Nam Nguyen <namnguyen@chromium.org>
Commit-Queue: Nam Nguyen <namnguyen@chromium.org>
3 files changed
tree: f06d470d35aac5094d762a727df93a233ee0f60a
  1. eclass/
  2. metadata/
  3. profiles/