add vm delete warning for ui element

salt/soc/dyanno/hypervisor/hypervisor.yaml

@@ -6,6 +6,7 @@ hypervisor:
       syntax: json
       file: true
       global: true
+      uiElementsDeleteMessage: "Warning: Following the actions below will permanently destroy the virtual machine."
       uiElements:
       - field: hostname
         label: "Hostname"