using tcp terminology for 3 way handshake: syn/syn_ack/ack 
renaming all functions, states, messages ... 


git-svn-id: https://gnunet.org/svn/gnunet@34232 140774ce-b5e7-0310-ab8b-a85725594a96
sensor: towards profiler


git-svn-id: https://gnunet.org/svn/gnunet@34233 140774ce-b5e7-0310-ab8b-a85725594a96
rename switching state


git-svn-id: https://gnunet.org/svn/gnunet@34234 140774ce-b5e7-0310-ab8b-a85725594a96