setting feedback with preference generator


git-svn-id: https://gnunet.org/svn/gnunet@33307 140774ce-b5e7-0310-ab8b-a85725594a96
towards peerstore iterate


git-svn-id: https://gnunet.org/svn/gnunet@33308 140774ce-b5e7-0310-ab8b-a85725594a96