Update to libsmall latest

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>
Add clients_context_handle

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>
poll-path: test latencies when reading a path & its child's data

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>