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This patch partially migrates away from ONC for populating the
following fields in arc::mojom::NetworkConfiguration:
 - guid
 - connection state
 - tethering state
 - network type
The equivalent shill properties directly cached in NetworkState are used
in state.

Migrating away from ONC and basing arc::mojom::NetworkConfiguration
creation directly on shill properties will facilitate the migration of
net.mojom outside of Chrome and into platform2/patchpanel.

BUG=b:145960788
TEST=Flashed Chrome, tested various connectivity setup in ARC, tested
scanning Apps.

Change-Id: I3c4d821cb1064638deac2a65d6ba372ace1b836b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210298
Commit-Queue: Hugo Benichi <hugobenichi@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772587}