Fix a failing unit test and import mistake from previous commits

cmd/placeholder-name/app/app_test.go

@@ -25,6 +25,8 @@ Usage:
   placeholder-name [flags]
 
 Flags:
+      --cluster-signing-cert-file string   path to cluster signing certificate
+      --cluster-signing-key-file string    path to cluster signing private key
   -c, --config string                      path to configuration file (default "placeholder-name.yaml")
       --downward-api-path string           path to Downward API volume mount (default "/etc/podinfo")
   -h, --help                               help for placeholder-name