- New core event dispatcher for ITTI: will allow a single task to monitor on...

- New core event dispatcher for ITTI: will allow a single task to monitor on multiple event sources via event_fd + epoll_wait apis
- Mutex per user for the ITTI dumper to avoid sending new signals when the XML is dumped to logger

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4328 818b1a75-f10b-46b9-bf7c-635c3b92a50f