- test if identity service is running
- default ego is used if none given



git-svn-id: https://gnunet.org/svn/gnunet@31143 140774ce-b5e7-0310-ab8b-a85725594a96
adding docu


git-svn-id: https://gnunet.org/svn/gnunet@31144 140774ce-b5e7-0310-ab8b-a85725594a96