Bug 17426: Do not set AutoCommit in tests

Bug 17426: Do not set AutoCommit in tests

  git grep AutoCommit t | grep 1

highlights that 1 test use AutoCommit set, it should not

The other change removes the FIXME should has been fixed.

Test plan:
  prove t/db_dependent/BackgroundJob.t
  t/db_dependent/Patron/Borrower_Discharge.t

should still return green

Signed-off-by: Marc <veron@veron.ch>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit ede157e9c09e08b772aaaaacd1a7eb64a2ecc9f6)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>