Example client to use the session rotation API

This client creates a session with all system calls enabled, offers
the option to rotate periodically the session (unlimited or only a
number of times), and call a script on each rotated chunk. The script
provided compresses the chunk and deletes the original.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>