veyron/services/proxy/proxyd: Add // to the published address.

Servers that are not mounttables should published addresses that end
with // to indicate that they don't need to be resolved further.

Change-Id: If99c538fd1ad826d173c6a4878359f58e81b58b2
diff --git a/services/proxy/proxyd/main.go b/services/proxy/proxyd/main.go
index 6e4d15c..043a45d 100644
--- a/services/proxy/proxyd/main.go
+++ b/services/proxy/proxyd/main.go
@@ -44,7 +44,7 @@
 		publisher := publisher.New(r.NewContext(), r.Namespace(), time.Minute)
 		defer publisher.WaitForStop()
 		defer publisher.Stop()
-		publisher.AddServer(naming.JoinAddressName(proxy.Endpoint().String(), ""))
+		publisher.AddServer(naming.JoinAddressName(proxy.Endpoint().String(), "//"))
 		publisher.AddName(*name)
 	}