rewrite all links to issues to k8s links

pkg/registry/generic/rest/proxy.go

@@ -89,7 +89,7 @@ func (h *UpgradeAwareProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Re
 
 	// From pkg/apiserver/proxy.go#ServeHTTP:
 	// Redirect requests with an empty path to a location that ends with a '/'
-	// This is essentially a hack for https://github.com/GoogleCloudPlatform/kubernetes/issues/4958.
+	// This is essentially a hack for http://issue.k8s.io/4958.
 	// Note: Keep this code after tryUpgrade to not break that flow.
 	if len(loc.Path) == 0 {
 		var queryPart string