v.io/syncbase: Package v.io/x/ref/test/security has moved to v.io/x/ref/test/testutil
v.io/syncbase: Package v.io/x/ref/test/security has moved to v.io/x/ref/test/testutil

Package v.io/x/ref/test/security has moved to v.io/x/ref/test/testutil.
This fixes two files in syncbase so they still compile.

Change-Id: I7d7ff4d320be3a5b62682c92a18ed31b3c2a3be0

vanadium/go.v23,vanadium/go.v23,vanadium/go.v23