[WIP] Add "wizard createconfig" command to easily populate configuration files

[fmartingr]

Summary

In order to make iteration, first usage and potentially development faster I see myself editing, copying and pasting files manually around so it occurred to me that having a command to easily populate the basics for configuration files would be particularily useful.

I envisioned this as a question-answer prompt, but having a command with flags seems more appropriate here and we can always evolve into something like that.

This Pull Request contains the first steps for that, allowing to run a ltctl wizard createconfig command with several flags to populate the config.json and deployment.json files with predefined values for an environment with an specific amount of active concurrent users (determines by the --active-users flag).

I added some draft structures around to define this architecture list borrowing the information from the references architectures work, but we would also need to define number of agents and all other load-test specific configuration.

This is just a first step/draft idea, let me know what you think @agnivade @agarciamontoro