Bug 19277: Make sure the tests will pass even if they are slow

Bug 19277: Make sure the tests will pass even if they are slow

This patch was my first attempt to fix the issue.
I think it is good to have it, if issue.timestamp and issue.issuedate are the same,
the result will be orderd by issue_id.
The tests highlight the fact that checkouts must be displayed in the
correct order.

Signed-off-by: Lee Jamison <ldjamison@marywood.edu>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>