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/kubectl/cmd/util/helpers_test.go

@@ -212,6 +212,7 @@ func (f *fileHandler) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 
 func TestReadConfigData(t *testing.T) {
 	httpData := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+	// TODO: Close() this server when fix #19254
 	server := httptest.NewServer(&fileHandler{data: httpData})
 
 	fileData := []byte{11, 12, 13, 14, 15, 16, 17, 18, 19}