-session header is now dead

git-svn-id: https://gnunet.org/svn/gnunet@33805 140774ce-b5e7-0310-ab8b-a85725594a96
-fix indent

git-svn-id: https://gnunet.org/svn/gnunet@33806 140774ce-b5e7-0310-ab8b-a85725594a96
-simplify deletion logic, tell monitor that we are initiator

git-svn-id: https://gnunet.org/svn/gnunet@33807 140774ce-b5e7-0310-ab8b-a85725594a96
-drastically simplify http server session cleanup (and startup) logic

git-svn-id: https://gnunet.org/svn/gnunet@33808 140774ce-b5e7-0310-ab8b-a85725594a96