-close /dev/random on shutdown

git-svn-id: https://gnunet.org/svn/gnunet@31283 140774ce-b5e7-0310-ab8b-a85725594a96
-fix path

git-svn-id: https://gnunet.org/svn/gnunet@31284 140774ce-b5e7-0310-ab8b-a85725594a96