Bug 13673: Silence noisy warnings in t/db_dependent/Barcodes.t

Bug 13673: Silence noisy warnings in t/db_dependent/Barcodes.t

This last patch catches all the warning messages in tests.

TEST PLAN
---------
1) Apply first two patches
2) $ prove t/db_dependent/Barcodes.t
   -- still noisy warnings.
3) apply last patch
4) $ prove t/db_dependent/Barcodes.t
   -- All noisy warnings are caught.
5) koha qa test tools.

Signed-off-by: Indranil Das Gupta <indradg@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>