Rename config root to "cleverage_process"

[shavounet]

Description

To keep some coherence, rename config root to "cleverage_process".

Requirements

• Documentation updates
  • Reference
  • Cookbooks
  • Changelog
• Unit tests

Breaking changes

• minor : future c:c will fail, but fix is easy

[xaviermarchegay]

@tonongregory do you add that in the v4?

[tonongregory]

@xaviermarchegay Not yet root config is still clever_age_process