Set default of rocket_storage to 0 (#422)

* set default of rocket_storage to 0

rocket_storage=0 means rocket_storage is disabled. This prevents inconsistency between the backend and terraform state.

* Set rocket storage = 0 in create/update payload when it's not specified

gridscale/resource_gridscale_k8s.go

@@ -114,6 +114,7 @@ func (rgk8sm *ResourceGridscaleK8sModeler) buildInputSchema() map[string]*schema
 		"rocket_storage": {
 			Type:        schema.TypeInt,
 			Optional:    true,
+			Default:     0,
 			Description: "Rocket storage per worker node (in GiB).",
 		},
 	}
@@ -928,11 +929,8 @@ func resourceGridscaleK8sCreate(d *schema.ResourceData, meta interface{}) error
 			nodePool["cores"] = d.Get(fmt.Sprintf("node_pool.%d.cores", index))
 			nodePool["storage"] = d.Get(fmt.Sprintf("node_pool.%d.storage", index))
 			nodePool["storage_type"] = d.Get(fmt.Sprintf("node_pool.%d.storage_type", index))
+			nodePool["rocket_storage"] = d.Get(fmt.Sprintf("node_pool.%d.rocket_storage", index))
 
-			// Set rocket storage if it is set
-			if rocketStorage, isRocketStorageSet := d.GetOk(fmt.Sprintf("node_pool.%d.rocket_storage", index)); isRocketStorageSet {
-				nodePool["rocket_storage"] = rocketStorage
-			}
 			nodePools = append(nodePools, nodePool)
 		}
 		parameters["pools"] = nodePools
@@ -1095,11 +1093,8 @@ func resourceGridscaleK8sUpdate(d *schema.ResourceData, meta interface{}) error
 			nodePool["cores"] = d.Get(fmt.Sprintf("node_pool.%d.cores", index))
 			nodePool["storage"] = d.Get(fmt.Sprintf("node_pool.%d.storage", index))
 			nodePool["storage_type"] = d.Get(fmt.Sprintf("node_pool.%d.storage_type", index))
+			nodePool["rocket_storage"] = d.Get(fmt.Sprintf("node_pool.%d.rocket_storage", index))
 
-			// Set rocket storage if it is set
-			if rocketStorage, isRocketStorageSet := d.GetOk(fmt.Sprintf("node_pool.%d.rocket_storage", index)); isRocketStorageSet {
-				nodePool["rocket_storage"] = rocketStorage
-			}
 			nodePools = append(nodePools, nodePool)
 		}
 		parameters["pools"] = nodePools