test: Add go_package directive

BUG=chromium:1062830
TEST=./generate.sh

Change-Id: Id20778aa78c6ff7396094ba2e04d008c18196c89
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2115944
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
Auto-Submit: Prathmesh Prabhu <pprabhu@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
Commit-Queue: Allen Li <ayatane@chromium.org>
5 files changed