Fix Jenkins Cross script to copy testdata properly
Fix Jenkins Cross script to copy testdata properly

`gsutil` changed its cp behavior starting with version 4.46, we need to change how we call it in order to preserve the directory structure our tests are expecting.
kubernetes/minikube,dalehamel/minikube,warmchang/minikube,dlorenc/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,kubernetes/minikube,dlorenc/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,dalehamel/minikube,dlorenc/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,dlorenc/minikube,dalehamel/minikube,dlorenc/minikube