Terraform creates iscsi VM with native fencing mechanism

[lpalovsky]

Description:
Terraform deployment creates iscsi VM despite tfvars fencing mechanism being set to 'native'.

Cloud provider: Azure

Openqa test: https://mordor.suse.cz/tests/4374#step/hana_sr_deployment/212
Output log: https://mordor.suse.cz/tests/4374/logfile?filename=serial_terminal.txt

  # module.iscsi_server.azurerm_virtual_machine.iscsisrv[0] will be created
  + resource "azurerm_virtual_machine" "iscsisrv" {
      + availability_set_id              = (known after apply)
      + delete_data_disks_on_termination = true
      + delete_os_disk_on_termination    = true
      + id                               = (known after apply)
      + license_type                     = (known after apply)
      + location                         = "westeurope"
      + name                             = "vmiscsi01"
      + network_interface_ids            = (known after apply)
      + resource_group_name              = "rg-ha-sap-hanasr49c3"
      + tags                             = {
          + "workspace" = "hanasr49c3"
        }
      + vm_size                          = "Standard_DS1_v2"

      + boot_diagnostics {
          + enabled     = true
          + storage_uri = (known after apply)
        }