Make enabling cloud_init optionnal

For cloud images that needs it, cloud_init can be enabled in the main.tf file. This change will allow deployments that does not require cloud_init to be supported

multiple/shared_modules/cloud-init.tf

@@ -1,8 +1,11 @@
+# Only create the cloudinit disk if enabled
 resource "libvirt_cloudinit_disk" "commoninit" {
-  name      = var.cloudinit_filename
+  count = var.enable_cloudinit ? var.instance_count : 0
+  
+  name      = "${var.cloudinit_filename}-${count.index}"
   user_data = templatefile("${path.module}/cloud_init.yaml", {
     ssh_key = var.ssh_key
   })
-  pool      =  "${var.vm_name}-pool"
+  pool      = "${var.vm_name}-pool"
   depends_on = [libvirt_pool.tf_tmp_storage]
 }