Reland "Delete duplicate protobuf definitions"

This is a reland of f1cba419431ffc462990f35bc234c4e9d1e384a5 without
deleting src/config/replication_config.proto.

Original change's description:
> Delete duplicate protobuf definitions
>
> These definitions now live in the chromiumos/config repo
>
> BUG=chromium:1054850
> TEST=./generate.sh
>
> Change-Id: If0db447160e2a2fcbee0824d5394b286d9dcf152
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2076686
> Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
> Auto-Submit: Prathmesh Prabhu <pprabhu@chromium.org>
> Reviewed-by: David Burger <dburger@chromium.org>
> Commit-Queue: David Burger <dburger@chromium.org>

BUG=chromium:1054850
TEST=manually verified.

Change-Id: I59ed32ed8dbea2de31acbb028d58f53959170cb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2101928
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
Commit-Queue: LaMont Jones <lamontjones@chromium.org>
Tested-by: LaMont Jones <lamontjones@chromium.org>
8 files changed