Add protobufs for commands used by build_parallels_image

Define ProvisionRequest and SaveRequest protos. These will be
used by new commands added to phosphorus.

BUG=chromium:1105967
TEST=./generate.sh

Change-Id: I31b1f227e06c13939e0b260d69226f7bb677e812
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2580921
Commit-Queue: Patrick Meiring <meiring@google.com>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
8 files changed