buffet: Add base GCD command definition .json file

Added gcd.json file to contain all standard command definitions
for all GCD-based device types, along with the commands' standard
parameters. Right now the file has a simple defintion for
base.reboot command.

Also moved buffet.conf to the new etc sub-directory to indicate
the target locataion for the file to be installed under on the
actual device image. As well as org.chromium.Buffet.conf moved
from buffet/dbus tp buffet/etc/dbus-1.

BUG=chromium:394913
TEST=build_image & cros deploy it onto a link device
CQ-DEPEND=CL:208779

Change-Id: I54da10bf6733685f9e2f0c945e7b7257f2904557
Reviewed-on: https://chromium-review.googlesource.com/208794
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
3 files changed
tree: 7f0dba1e39e3568d929a6c0e88d7fa8300364a7b
  1. buffet/