-assign port for DNS

git-svn-id: https://gnunet.org/svn/gnunet@34745 140774ce-b5e7-0310-ab8b-a85725594a96
-do not start unrelated services during ATS tests

git-svn-id: https://gnunet.org/svn/gnunet@34746 140774ce-b5e7-0310-ab8b-a85725594a96