Rudder

Testing three cases:

- a rule applying to root server only should never appear in the list of futur directives
- a rule applying to a group based on a node property should be listed if the pending node has that property set from an inventory hook
- same as above, but with "reverse": if the node has the prop, the rule should not be listed ; if it is missing the prop, it should be.

Checked:

- rule for root only does not appear,
- rule based on a property and the node has the prop appears,
- (invert result of group based on property) and the node has the prop: the rule appears