Always explicitly set AuthType to none in unconfigured-ignition

The unconfigured-ignition does not contain any auth keys. In the
appliance, all of the auth settings are part of the config-image.
Whatever settings are applied in the ignition get overwritten before any
of the services that use them start.

However, for the interactive install we must explicitly set the AuthType
to "none" to prevent services looking for keys that are not actually
generated.

pkg/asset/agent/image/unconfigured_ignition.go

@@ -161,6 +161,7 @@ func (a *UnconfiguredIgnition) Generate(_ context.Context, dependencies asset.Pa
 		InfraEnvID:                infraEnvID,
 		OSImage:                   osImage,
 		Proxy:                     infraEnv.Spec.Proxy,
+		AuthType:                  "none",
 	}
 
 	enabledServices := getDefaultEnabledServices()
@@ -202,8 +203,6 @@ func (a *UnconfiguredIgnition) Generate(_ context.Context, dependencies asset.Pa
 		interactiveUIFile := ignition.FileFromString("/etc/assisted/interactive-ui", "root", 0644, "")
 		config.Storage.Files = append(config.Storage.Files, interactiveUIFile)
 
-		// Let's disable the assisted-service authentication.
-		agentTemplateData.AuthType = "none"
 	}
 
 	// Required by assisted-service.