Technical boilerplate for hooklng up a new servod service.

DiagnoseMe needs a grpc wrapper around servod and mananging
the servod container, this is mostly the boilerplate/wriring
for that new service.

Implementation of the service to follow.

BUG=
TEST=local build/test

Change-Id: I0640524c8f5a974d8840517c1e59bad4a08a06f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/hwtools/diagnoseme/+/6832668
Reviewed-by: Łukasz Hajec <hajec@google.com>
Commit-Queue: Łukasz Hajec <hajec@google.com>
Auto-Submit: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: 488603086791@cloudbuild.gserviceaccount.com <488603086791@cloudbuild.gserviceaccount.com>