Bug 13799: (QA followup) make tests use random data

Bug 13799: (QA followup) make tests use random data

With the introduction of TestBuilder there's no need to
rely on existing data on the DB (the original patch relies
on categories and branches already existing).

This patch creates a random branch, category and two borrowers
with the fixed data that is needed for the tests. It adjusts
the tests to use the randomized data instead of the previously
fixed one.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
The feature works as expected and all tests passes. koha-qa.pl too.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>