Rudder

NCf framework is updated independently from the Rudder promises
On every node, we make a find on /var/rudder/ncf to load ncf promises
However, /var/rudder/ncf is copied from /usr/share/ncf/tree via the client-server connectivity
If we have new promises, that relies on a change in /var/rudder/ncf, but that didn't have time to be propagated, it will never succeed, and make the cf-serverd unworkable.
On the policy server, we should rely on local copy for updating ncf to prevent this issue