Comment out calls to httptest.Server.Close() to work around

https://github.com/golang/go/issues/12262 . See #19254 for
more details. This change should be reverted when we upgrade
to Go 1.6.

pkg/proxy/userspace/proxier_test.go

@@ -90,6 +90,7 @@ func init() {
 	util.ReallyCrash = true
 
 	// TCP setup.
+	// TODO: Close() this when fix #19254
 	tcp := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte(r.URL.Path[1:]))