- don't always cancel channel's task on confirm: might be a duplicate confirm and task is then a copy retransmit


git-svn-id: https://gnunet.org/svn/gnunet@31452 140774ce-b5e7-0310-ab8b-a85725594a96
- refine break condition


git-svn-id: https://gnunet.org/svn/gnunet@31453 140774ce-b5e7-0310-ab8b-a85725594a96
- register keepalive for destruction


git-svn-id: https://gnunet.org/svn/gnunet@31454 140774ce-b5e7-0310-ab8b-a85725594a96