adding linear and saw wave support for traffic generator


git-svn-id: https://gnunet.org/svn/gnunet@32140 140774ce-b5e7-0310-ab8b-a85725594a96
sinus support for traffic generator


git-svn-id: https://gnunet.org/svn/gnunet@32141 140774ce-b5e7-0310-ab8b-a85725594a96