incomplete code for finger and friend tables

git-svn-id: https://gnunet.org/svn/gnunet@31986 140774ce-b5e7-0310-ab8b-a85725594a96
- Test if we are shutting down (on Ctrl-C, for instance)

git-svn-id: https://gnunet.org/svn/gnunet@31987 140774ce-b5e7-0310-ab8b-a85725594a96
- don't try to rekey loopback tunnels (#3254)

git-svn-id: https://gnunet.org/svn/gnunet@31988 140774ce-b5e7-0310-ab8b-a85725594a96
initial preliminary commit for ats testing lib and simulator tool


git-svn-id: https://gnunet.org/svn/gnunet@31989 140774ce-b5e7-0310-ab8b-a85725594a96