-misc fixes

git-svn-id: https://gnunet.org/svn/gnunet@31526 140774ce-b5e7-0310-ab8b-a85725594a96
fix for bt plugin and set nonce to 0


git-svn-id: https://gnunet.org/svn/gnunet@31527 140774ce-b5e7-0310-ab8b-a85725594a96