core: Instance/EvalDiff.Quiet -> Stub

Changed the language of this field to indicate that this diff is not a
"real" diff, in that it should not be acted on, versus a "quiet" mode,
which would indicate just simply to act silently.

backend/local/hook_count.go

@@ -100,8 +100,8 @@ func (h *CountHook) PostDiff(
 		return terraform.HookActionContinue, nil
 	}
 
-	// Don't count anything for a Quiet diff
-	if d.Quiet {
+	// Don't count anything for a Stub diff
+	if d.Stub {
 		return terraform.HookActionContinue, nil
 	}
 

terraform/diff.go

@@ -374,10 +374,10 @@ type InstanceDiff struct {
 	// The value here must only contain Go primitives and collections.
 	Meta map[string]interface{}
 
-	// Quiet should be set when this diff exists only for purposes of providing a
+	// Stub should be set when this diff exists only for purposes of providing a
 	// diff to various pre-plan or dry-run steps in the graph. A diff with this
 	// enabled should not be acted on in the plan.
-	Quiet bool
+	Stub bool
 }
 
 func (d *InstanceDiff) Lock()   { d.mu.Lock() }

terraform/eval_diff.go

@@ -82,10 +82,11 @@ type EvalDiff struct {
 	// filter user-requested ignored attributes from the diff.
 	Resource *config.Resource
 
-	// Quiet is used to indicate that this count should not be used in the UI.
-	// This is used with refresh nodes on scale-out so that resources do not get
-	// counted twice in the UI output.
-	Quiet bool
+	// Stub is used to flag the generated InstanceDiff as a stub. This is used to
+	// ensure that the node exists to perform interpolations and generate
+	// computed paths off of, but not as an actual diff where resouces should be
+	// counted, and not as a diff that should be acted on.
+	Stub bool
 }
 
 // TODO: test
@@ -162,8 +163,10 @@ func (n *EvalDiff) Eval(ctx EvalContext) (interface{}, error) {
 		return nil, err
 	}
 
-	// Flag quiet to ensure that this resource is skipped in post-diff hooks, such as count, etc.
-	diff.Quiet = n.Quiet
+	// Flag stub in the diff if set in the eval node. This ensures that this
+	// resource is skipped in post-diff hooks, such as count, etc, and is usually
+	// set in a pre-plan phase.
+	diff.Stub = n.Stub
 
 	// Call post-refresh hook
 	err = ctx.Hook(func(h Hook) (HookAction, error) {

terraform/node_resource_refresh.go

@@ -234,7 +234,7 @@ func (n *NodeRefreshableManagedResourceInstance) evalTreeManagedScaleInResource(
 				Provider:    &provider,
 				State:       &state,
 				OutputState: &state,
-				Quiet:       true,
+				Stub:        true,
 			},
 			&EvalWriteState{
 				Name:         stateID,