If config_file is unchanged, ask user for them interactively

If config_file is unchanged, ask user for them interactively

```
If any defaults in config file have been changed, say so and skip config

while not approved

    Ask user for hostname, smtp config, letsencrypt
    Print values
    ask user if approved

(Trust that if user approves, the values are OK)

Write changes to config_file

Ask user to "Enter or ^C"

```

Most users will be satisfied and press enter to continue normal
bootstrap. Advanced users can ^C, edit config_file and then `./launcher
bootstrap app` with their tweaks.