Indeed "kill_vm" is not a good value because there is a parameter named "kill_vm". And a long time ago, @cevich and I discussed "start_vm" and "kill_vm" parameters...and I perfer to add a new parameter named "kill_vm_before_test" to cover this situation. I thinks it's easy to understand for user.And modify "kill_vm" to be "kill_vm_after_test". Is that OK?