Bug 17249: Remove GetKohaAuthorisedValuesFromField - add tests

Bug 17249: Remove GetKohaAuthorisedValuesFromField - add tests

This patch adds a few tests to C4::Record::marcrecord2csv
The subroutine was not covered enough to validate that this patch set
won't add regressions.

Note that the patch set will fix an issue: If 2 subfields of a field are
linked to AVs and you want to display them in a CSV, they won't be
replaced with their descriptions.

Test plan:
Apply the patch, and make a copy of t/db_dependent/Record/marcrecord2csv.t
Checkout master and prove marcrecord2csv.t
Tests should fail
Checkout the branch with the whole patch set applied
The tests should pass

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Mason James <mtj@kohaaloha.com>