Bug 14711: Change prototype for AddReserve - pass a hashref

Bug 14711: Change prototype for AddReserve - pass a hashref

The number of parameters of AddReserve makes it hard to read and
maintain.
This patch replace it with a hashref, which will make the calls more
readable.

Moreover the bibitems has been removed as it was not used by the
subroutine.

Test plan:
- Make sure the tests pass
- Read the diff and search for typos
- Place a hold on few items

Note for QA: reservation_date and expiration_date do not match the DB column's names,
should we?

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>