Added TODO about public key removal logic.

common/step_cleanup_temp_keys.go

@@ -38,6 +38,7 @@ func (s *StepCleanupTempKeys) Run(_ context.Context, state multistep.StateBag) m
 
 	ui.Say("Trying to remove ephemeral keys from authorized_keys files")
 
+	// TODO: Why create a backup file if you are going to remove it?
 	cmd.Command = fmt.Sprintf("sed -i.bak '/ %s$/d' ~/.ssh/authorized_keys; rm ~/.ssh/authorized_keys.bak", s.Comm.SSHTemporaryKeyPairName)
 	if err := cmd.StartWithUi(comm, ui); err != nil {
 		log.Printf("Error cleaning up ~/.ssh/authorized_keys; please clean up keys manually: %s", err)