veyron/runtimes/google/rt: Add veyron2.InitForTest method.
veyron/runtimes/google/rt: Add veyron2.InitForTest method.

Change-Id: I21610d90f71d3031ed0cc6141206d24558bab26b

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref