Fix Python interpreter in revocation test

git-svn-id: https://gnunet.org/svn/gnunet@31029 140774ce-b5e7-0310-ab8b-a85725594a96
missing file

git-svn-id: https://gnunet.org/svn/gnunet@31030 140774ce-b5e7-0310-ab8b-a85725594a96