abstract unix domain socket support


git-svn-id: https://gnunet.org/svn/gnunet@32276 140774ce-b5e7-0310-ab8b-a85725594a96
stop notifications on delete


git-svn-id: https://gnunet.org/svn/gnunet@32277 140774ce-b5e7-0310-ab8b-a85725594a96