At the moment if you have multiple notifiers it becomes impossible
to figure out when it is safe to free the values.
This new callback can only be added once and is called
once, making it better suited to freeing memory. It is
also called after the deleted and replaced notifiers.
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
This allows you to match on the same fields that you provided
in the add. Now including the userdata.
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>