Rudder

We want to add a CFEngine class for each group of a node, so that logic can be built based on the knowledge that a node belongs to a specific group.

For a given group, we propose to add two classes:

- one with the normalized name of the group.

That identifier may change other time, so we also propose the second class:

- one with the name: group_UUID, where "UUID" is replaced by the group unique identifier.

That second class name will be far less telling, but it has the advantage to be stabe over time.

We also are going to add a CFEngine variables "rudder_groups", an array of UUID -> classe names.