minor corrections to revocation service
revocation testtest now passes


git-svn-id: https://gnunet.org/svn/gnunet@30905 140774ce-b5e7-0310-ab8b-a85725594a96
- plug leak


git-svn-id: https://gnunet.org/svn/gnunet@30906 140774ce-b5e7-0310-ab8b-a85725594a96