Add support for auxiliary data to shopfloor server.

Also fix lint errors in simple_shopfloor.py.

BUG=chrome-os-partner:10699
TEST=make lint test

Change-Id: I4be319c72e6c5365f58111c168337db1ef46b43e
Reviewed-on: https://gerrit.chromium.org/gerrit/31404
Tested-by: Jon Salz <jsalz@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Ready: Jon Salz <jsalz@chromium.org>
7 files changed