fix(nebula): correct image usage in template

modules/nebula/main.tf

@@ -108,8 +108,12 @@ resource "opennebula_template" "vm_template" {
     }
   }
   permissions = var.permissions
+  depends_on = [ opennebula_image.system ]
+
+  /* Not needed now
   depends_on = [ opennebula_image.system,
                  opennebula_image.data ]
+  */
 }
 
 resource "opennebula_virtual_machine" "vm" {