Add UEFI support

[vdombrovski]

This adds a new boolean parameter to the cloudstack_instance resource, called "uefi". When set, the instance will boot in UEFI/Legacy mode.

[bragonznx]

@vdombrovski whaouuuuuu : awesome, thanks for this; it's very usefull.

[kiranchavala]

LGTM

Created UEFI enabled host and registered a UEFI template

Deployed a vm from terraform succefully

resource "cloudstack_instance" "test-vm" {
  name             = var.instance_name
  service_offering = var.instance_service_offering
  network_id       = cloudstack_network.test-network.id
  template         = var.instance_template
  zone             = var.zone
  uefi = true
  expunge = true
  depends_on = [
   cloudstack_network.test-network
 ]
  
}


  # cloudstack_instance.test-vm will be created
  + resource "cloudstack_instance" "test-vm" {
      + display_name     = (known after apply)
      + expunge          = true
      + group            = (known after apply)
      + id               = (known after apply)
      + ip_address       = (known after apply)
      + name             = "hyd-demo-test"
      + network_id       = (known after apply)
      + project          = (known after apply)
      + root_disk_size   = (known after apply)
      + service_offering = "17dfb0b2-a153-4aae-aa79-41d830cf061b"
      + start_vm         = true
      + tags             = (known after apply)
      + template         = "ce2c6626-9dc9-4f3e-abea-a34bc6ee009f"
      + uefi             = true
      + zone             = "3e99a7d7-f23c-4650-8fc4-f5ebb9ea06c9"
    }



cloudstack_instance.test-vm: Still creating... [30s elapsed]
cloudstack_instance.test-vm: Still creating... [40s elapsed]
cloudstack_instance.test-vm: Creation complete after 49s [id=eccbfa4b-f932-4489-af08-78aee336aabd]