Bug 25855: Add a post_renewal_action plugin hook

Bug 25855: Add a post_renewal_action plugin hook

This patch adds a new hook to notify plugins about renewal actions. To
test it:

1. Apply the unit tests
2. Run:
   $ kshell
  k$ prove t/db_dependent/Koha/Plugins/Circulation_hooks.t
=> FAIL: The tests expect some warnings to show, and they don't (i.e.
        the sample plugin hook is not being called).
3. Apply this patch
4. Repeat 2
=> SUCCESS: Tests pass! The hook is being called on renewal!
5. Sign off :-D

Sponsored-by: ByWater Solutions
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>