Rudder

In #8921, we changed the way we detect Enterprise agent, by detecting on /var/cfengine
But, on every policy server, we do have a /var/cfengine - so, inventory contains an entry for cfengine nova, in the Rudder extension
However, the install is partial - no policy-server uuid is defined there, so the entry ends up invalid, and is ignored by the server
We simply have a nasty error log, but e should revert to the old path for detection