Fix lookup test (#206)

* Always continue

* debug queries: more sane impl

This PR just add a msg.Service to debug instead of crafting an TXT RR
at that point. This way we lift on the normal way of generating debug
responses and don't muck with that implementation.

The tags=etcd is flaky as hell for some reason.

middleware/etcd/etcd.go

@@ -24,7 +24,7 @@ type Etcd struct {
 	Client     etcdc.KeysAPI
 	Ctx        context.Context
 	Inflight   *singleflight.Group
-	Stubmap    *map[string]proxy.Proxy // List of proxies for stub resolving.
+	Stubmap    *map[string]proxy.Proxy // list of proxies for stub resolving.
 	Debug      bool                    // Do we allow debug queries.
 }