TODO

   1 TODOS:
   2 --------
   3
   4 * Add --socket option if no HOME found (sessiond)
   5 * Use realloc() in ask_sessiond() (liblttngctl)
   6 * Multiple level of debug, DBG1, DBG2, DBG3 with -vvv (sessiond)
   7 * perror() --> PERROR()
   8 * When add context EEXIST error should inform the client that already exist.
   9 * Use lockfree hashtable for traceable-app, events list and channels list.