- less verbose debug

git-svn-id: https://gnunet.org/svn/gnunet@33029 140774ce-b5e7-0310-ab8b-a85725594a96
- don't free connections in the middle of being build.
- fixes #3373, #3361

git-svn-id: https://gnunet.org/svn/gnunet@33030 140774ce-b5e7-0310-ab8b-a85725594a96