Amend grant agreement secret management

[Ra33it0]

Amendment

Upon further evaluation, it turned out that requiring Vault to run a validator adds unnecessary complexity for no real benefit to users that don't already utilize Vault. Effectively, at the moment, Vault would only be used to deliver already existing credentials to a single validator. So even though it would be possible to automatically spin up a Vault cluster alongside the validator, it would neither increase security nor ergonomics of Dotnix. The fact that the validator secrets have to exist unencrypted on the filesystem anyway allows for a simpler implementation where the user can manage secrets using a command line utility with no need for additionally running services.

This does not prevent a future integration with Vault, but creates a base line and a convenient interface for the user.

We already have implemented a succeeding test scenario that provides secrets from Vault to the validator.
This work has been pushed to will be kept for future reference in a separate branch: https://github.com/sporyon/dotnix-core/compare/vault

[semuelle]

Thanks for submitting the amendment, @Ra33it0. Could you remove the application template content from the pull request body and instead explain what changes this amendment makes and why you want to do them?

[PieWol]

Thanks for taking your time and adjusting the application!