TBR: veyron/tools/servicerunner: import "core" to pick up the mt, proxy, etc cmds

Change-Id: I61f80af0a35f8525591b136a8690f14aca79fa7b
diff --git a/tools/servicerunner/main.go b/tools/servicerunner/main.go
index 00b00ff..839af0d 100644
--- a/tools/servicerunner/main.go
+++ b/tools/servicerunner/main.go
@@ -14,6 +14,7 @@
 	"veyron.io/veyron/veyron/lib/expect"
 	"veyron.io/veyron/veyron/lib/flags/consts"
 	"veyron.io/veyron/veyron/lib/modules"
+	_ "veyron.io/veyron/veyron/lib/modules/core"
 	_ "veyron.io/veyron/veyron/profiles"
 )