backend/swift: Fix interface after upgrade

backend/remote-state/swift/backend.go

@@ -109,7 +109,7 @@ func New() backend.Backend {
 			"insecure": &schema.Schema{
 				Type:        schema.TypeBool,
 				Optional:    true,
-				DefaultFunc: schema.EnvDefaultFunc("OS_INSECURE", ""),
+				DefaultFunc: schema.EnvDefaultFunc("OS_INSECURE", nil),
 				Description: descriptions["insecure"],
 			},
 
@@ -256,7 +256,6 @@ func (b *Backend) configure(ctx context.Context) error {
 		DomainName:       data.Get("domain_name").(string),
 		EndpointType:     data.Get("endpoint_type").(string),
 		IdentityEndpoint: data.Get("auth_url").(string),
-		Insecure:         data.Get("insecure").(bool),
 		Password:         data.Get("password").(string),
 		Token:            data.Get("token").(string),
 		TenantID:         data.Get("tenant_id").(string),
@@ -265,6 +264,11 @@ func (b *Backend) configure(ctx context.Context) error {
 		UserID:           data.Get("user_id").(string),
 	}
 
+	if v, ok := data.GetOkExists("insecure"); ok {
+		insecure := v.(bool)
+		config.Insecure = &insecure
+	}
+
 	if err := config.LoadAndValidate(); err != nil {
 		return err
 	}