Allows to set the set of services exported providing a AfgsServicesProvided object.
This function set up all available services for the actual server.
|services ||Services to be exported.|
Actually, this function generate a list of services provided for actual server by merging services provided by the server programmer and services provided by afgs library.
One of those service, provided by afgs, is set_connection_key, needed by afgs layer to authenticate user.