[GOAL2-624] Add a kmd_config.json.example to the installer dir

[EvanJRichard]

Summary

A common request from developers is for some kind of kmd_config.json.example to look at and work from. This PR proposes to add such an example to the installer dir, next to the normal algod config.json.example. It is equivalent to the current default kmd configuration.

Test Plan

Automated test suite will check for regressions.

[tsachiherman]

I think that you'll need to do bit more than just that -

1. Format the json so it would be human readable ( unless there is a good reason not to do so )
2. Add this json to the following locations -
   • installer/rpm/algorand.spec
   • scripts/build_deb.sh
   • scripts/build_package.sh

[EvanJRichard]

@tsachiherman wrote:

I think that you'll need to do bit more than just that -

1. Format the json so it would be human readable ( unless there is a good reason not to do so )

2. Add this json to the following locations -

   • installer/rpm/algorand.spec
   • scripts/build_deb.sh
   • scripts/build_package.sh

👍 Formatted the file for 1.), good thinking.
Re 2.) - isn't that only needed if the file is to be installed somewhere? My sole goal here is to provide an example for devs to look at.
Context: To be used, a kmd_config.json needs to be in the kmd-{$version_changes_over_time} data directory, which doesn't exist until kmd is run for the first time. So, I'm not sure it can easily be copied to the right destination from the installer scripts, the desired destination isn't yet created and its version is unknown. (I will find a way if we think it should really be installed, though! 🙂)

[rotemh]

I'd go for another kind of change. Don't create the file yourself. kmd has a function that tries to read a config file, if it fails and returns the default one.
Modify the function to also dump the example file. That way you guarantee consistency of the fields.

[Karmastic]

Use codecs.SaveObjectToFile() and save it formatted.

[bylun]

Where to modify the default configuration ip and port?

[tsachiherman]

Proposed code would save the file on every instance invocation. Was that the intent ?

[tsachiherman]

looks good. I like the idea of self-generating config files compared to static ones.