Rudder

When upgrading from 3.1 to 4.0, we have a several minute long "no reports" on the web interface
Reason is promises are invalids as long as the update didn't kick in on the Rudder Server: old ncf is still used and distributed

Output of run agent is:

E| compliant     server-roles              Check WebDAV credentials                     The Rudder WebDAV user and password are OK
Formal =  {'message','old_class_prefix'}, Actual =  {'Check if the service httpd is started using ps','service_check_running_httpd','','@{args}'}
error    Rudder agent was interrupted during execution by a fatal errors
         Run with -i to see log messages.

so new promises are distributed (generated by the web interface), but old ncf is still distributed

Targeting 3.2 as it happens also on upgrade from 3.1 to 3.2