Bug 26831: Use new PurgeListShareInvitesOlderThan syspref

Bug 26831: Use new PurgeListShareInvitesOlderThan syspref

Enable librarians in the staff client to control when unaccepted list
invites will be removed from the database.

Test plan:
1. Apply patches

2. Update database
sudo koha-shell <instance>
cd installer/data/mysql
./updatedatabase.pl

3. Confirm the PurgeListShareInvitesOlderThan syspref = 14

4. Run cleanup_database.pl with --list-invites parameter defined:
sudo koha-shell <instance>
cd misc/cronjobs
./cleanup_database.pl --list-invites 10 -v

5. Confirm the output contains:
"Purging unaccepted list share invites older than 10 days."

6. Set PurgeListShareInvitesOlderThan syspref = 15

7. Run cleanup_database.pl without the --list-invites parameter:
sudo koha-shell <instance>
cd misc/cronjobs
./cleanup_database.pl -v

8. Confirm the output contains:
"Purging unaccepted list share invites older than 15 days."

9. Empty PurgeListShareInvitesOlderThan syspref

10. Run cleanup_database without the --list-invites parameter:
sudo koha-shell <instance.
cd misc/cronjobs
./cleanup_database.pl

11. Observe you get the following output (along with documentation on all
parameters of the script):
"You did not specify any cleanup work for the script to do."

12. Run the cleanup_database with no days defined for the --list-invites
parameter:
sudo koha-shell <instance>
cd misc/cronjobs
./cleanup_database.pl --list-invites -v

13. Confirm the output contains:
"Purging unaccepted list share invites older than 14 days."

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>