BUG/MEDIUM: lua/notification: memory leak

BUG/MEDIUM: lua/notification: memory leak

The thread patches adds refcount for notifications. The notifications are
used with the Lua cosocket. These refcount free the notifications when
the session is cleared. In the Lua task case, it not have sessions, so
the nofications are never cleraed.

This patch adds a garbage collector for signals. The garbage collector
just clean the notifications for which the end point is disconnected.

This patch should be backported in 1.8