- dump keys to STRERR on debug, if flag is on

git-svn-id: https://gnunet.org/svn/gnunet@34073 140774ce-b5e7-0310-ab8b-a85725594a96
- more info on buildbot errors

git-svn-id: https://gnunet.org/svn/gnunet@34074 140774ce-b5e7-0310-ab8b-a85725594a96