Bug 21301: Remove patron informations in issues for GetRecords ILS-DI service

Bug 21301: Remove patron informations in issues for GetRecords ILS-DI service

Actually, the GetRecords service gives many information :
bibliographic data (marcxml field)
item data (items field)
issue data (issues field)

The issue data should not be sent by these service, its a privacy problem.
Biblio title and author are redundant.
This patch changes to use Koha::Checkouts to get issues informations with only the addition of item barcode.

Test plan :
1) Enable ILS-DI webservice
2) Checkout an item
3) Go to {opac}/cgi-bin/koha/ilsdi.pl?service=GetRecords&id={biblionumber}
4) Check the issues tag content

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>