Control au checks with has_chromeos_firmware. Cleaned old labels.

Some of the new test hardware doesn't have Chrome OS firmware, so it
will never pass some of the extended AU checks. As such, allow these
checks to be controlled by a host label.

I've also cleaned up some dead labels as well as changed the default on
the has_bluetooth label to the more common case.

BUG=none
TEST=run_remote_tests. Ran in production.

Change-Id: Ifd19a51d780e801a649aaa43e060327ef4af31e9
Reviewed-on: http://gerrit.chromium.org/gerrit/2575
Reviewed-by: Paul Pendlebury <pauldean@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Dale Curtis <dalecurtis@chromium.org>
3 files changed