Bug 32518: Add reason option to cancel_unfilled_holds cronjob

Bug 32518: Add reason option to cancel_unfilled_holds cronjob

This adds a reaosn parameter and passes it into the cancellation if supplied

To test:
1 - Place a hold for a patron in your system
2 - Run script with --days 0 -v
3 - verify that it would cancel the reserves (and that you are okay with cancelling the ones it found)
4 - Make sure you have a notice in the holds module with code 'HOLD_CANCELLATION'
5 - Set content of the notice like:
[% IF hold.cancellation_reason=='too_old' %]
Canceled old
[% END %]
6 - Run script with --days 0 -v --reason too_bad -c
7 - Confirm hold cancelled, no notice sent to patron
8 - Place another hold
9 - Run script with --days 0 -v --reason too_old -c
10 - Confirm hold cancelled, notice sent to patron

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>