shill: add operator uuid key

We may need a more stable identifier for cellular operators than
the name or MCC/MNC pair, so we can export the UUID from the mobile
operator DB to serve this purpose. This will be used in CL:734005.

BUG=chromium:37953355
TEST=emerge, deploy, get Cellular.HomeProvider property from Device
  and Cellular.ServingOperator from Service and ensure both have a
  UUID entry

Change-Id: I0b03eee9b33f5a1f19b84f30883aeb044c2ced76
Reviewed-on: https://chromium-review.googlesource.com/733818
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Eric Caruso <ejcaruso@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
1 file changed