execute: validate that RTD can connect to grpc services

BUG=chromium:1149702
TEST=local runs

Change-Id: Iae89b5a48646aebec3f935d721684995e58f0f00
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/tnull/+/2570326
Tested-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@google.com>
Commit-Queue: Prathmesh Prabhu <pprabhu@google.com>
Auto-Submit: Sean Abraham <seanabraham@chromium.org>
1 file changed