makeaci, makeapi, oddjob: use the default API context
    
    Use the default context rather the server context for code not running
    inside the server.
    
    This prevents the affected code from attempting to initialize the session
    manager.
    
    https://fedorahosted.org/freeipa/ticket/5988
    
    Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>