privetd: Implement privet/v3/commands/status

Privetd just forwards IDs to the buffet and buffet returns JSON
representation of the command.

BUG=brillo:430
TEST=unittest

Change-Id: I5698f9fc915ae32dc2b9be3cc35f8efe919ee4e3
Reviewed-on: https://chromium-review.googlesource.com/261641
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
3 files changed
tree: a68ec0bcb6ea809bc27974083ab8881ec6fda07c
  1. buffet/