Rudder

Hello,

Following our discussion on IRC, it would be great to have a way to commit multiple actions at once instead of having Rudder launch a generation each time.
Example 1 - New service implementation:
- Create a new group and add nodes in there
- Create a directive to manage services
- Create a directive to handle packages
- Create a directive to manage configuration files
- Finally add a rule to apply directives on the group

This amounts to 5 non really needed generations that could have easily been replaced by only one when done with the work

Example 2 - Heavy modification of an existing service:
For each directive changes on this service, i'll have a generation running, this could lead to nodes fetching intermediate configuration that could potentially break the service.
This could be avoided by having a way to commit when the work is done and nodes would only sync a clean configuration.

Thanks,
Olivier