amd_session_agent now sends an APP_DEAD_SIGNAL request to amd daemon to signal the end of an app

Change-Id: Ic1c9d2ba79c414cb73d547ff240c88df414351b9
Merge branch 'tizen' of git.vannes:/srv/git/gitcache/github.com/eurogiciel-oss/aul-ng into tizen