Fix test data for svctool after gRPC V2.
Fix test data for svctool after gRPC V2.

TBR=nodir@chromium.org
BUG=None
TEST=None

Review URL: https://codereview.chromium.org/1907623002

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go