buffet: Support cloud command proxy.

This proxy allows publishing command updates to cloud API.

BUG=chromium:432540
TEST=cros_workon_make buffet --test&&manual

Change-Id: Id5730df60c3d40dfb7254d5f65c84dc51aea09eb
Reviewed-on: https://chromium-review.googlesource.com/228462
Reviewed-by: Anton Muhin <antonm@chromium.org>
Commit-Queue: Anton Muhin <antonm@chromium.org>
Tested-by: Anton Muhin <antonm@chromium.org>
6 files changed
tree: 4808dede76686bfb1b4ae1fda0c129a99e89d7e8
  1. buffet/