Add a little bit more logging to a test so that if it times out we have more debugging.

cmd/e2e/e2e.go

@@ -485,6 +485,7 @@ func TestClusterDNS(c *client.Client) bool {
 		if len(failed) == 0 {
 			break
 		}
+		glog.Infof("lookups failed for: %v", failed)
 		time.Sleep(3 * time.Second)
 	}
 	if len(failed) != 0 {