veyron/services/store/testutil: import type registry hack so that
tests that use the mock store with user-defined types do not panic.

Change-Id: I209786d6f36b3208a9974a45080f6f270ab1a6e8
diff --git a/services/store/testutil/store.go b/services/store/testutil/store.go
index 50feb22..9190f09 100644
--- a/services/store/testutil/store.go
+++ b/services/store/testutil/store.go
@@ -7,6 +7,7 @@
 	"testing"
 
 	istore "veyron/services/store/server"
+	_ "veyron/services/store/typeregistryhack"
 
 	"veyron2/ipc"
 	"veyron2/naming"