Re-create the pod "mount" if it already exists

[madura96]

If we execute the program twice, it gives an error because it tries to create the same pod "mount" that was created in the first execution.
We should, re-create the pod or apply only the changes as in: kubectl apply -f pod.yaml (if changes are permitted).

NB: rename the pod from "mount" to "kpod-mount-pvc" to be more explicit