cli/command/network: use stdlib errors, remove errdefs uses

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/network/remove_test.go

@@ -8,11 +8,18 @@ import (
 
 	"github.com/docker/cli/internal/test"
 	"github.com/docker/docker/api/types/network"
-	"github.com/docker/docker/errdefs"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 )
 
+type forBiddenErr struct{ error }
+
+func (forBiddenErr) Forbidden() {}
+
+type notFoundErr struct{ error }
+
+func (notFoundErr) NotFound() {}
+
 func TestNetworkRemoveForce(t *testing.T) {
 	tests := []struct {
 		doc         string
@@ -68,9 +75,9 @@ func TestNetworkRemoveForce(t *testing.T) {
 				networkRemoveFunc: func(ctx context.Context, networkID string) error {
 					switch networkID {
 					case "no-such-network":
-						return errdefs.NotFound(errors.New("no such network: no-such-network"))
+						return notFoundErr{errors.New("no such network: no-such-network")}
 					case "in-use-network":
-						return errdefs.Forbidden(errors.New("network is in use"))
+						return forBiddenErr{errors.New("network is in use")}
 					case "existing-network":
 						return nil
 					default: