re-add address on connect


git-svn-id: https://gnunet.org/svn/gnunet@32821 140774ce-b5e7-0310-ab8b-a85725594a96
make plugin fail if bind fails ...


git-svn-id: https://gnunet.org/svn/gnunet@32822 140774ce-b5e7-0310-ab8b-a85725594a96