Bug 23038: Hide expected warnings from tests

Bug 23038: Hide expected warnings from tests

When tests are ran, there are 2 warnings that are expected and raised by
DBI.
As they are expected they must be correctly caught and not displayed.

We could have reconnect with PrintError turned off, but then reconnect
with it on.

Test plan:
% prove t/db_dependent/Circulation/MarkIssueReturned.t t/db_dependent/Suggestions.t
Must not display DBI warnings

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>