Bug 28013: Performance improvements to CanBookBeRenewed

Bug 28013: Performance improvements to CanBookBeRenewed

In the case of 'AllowRenewalIfOtherItemsAvailable' we check all existing reserves against
all existing items. This patchset reduces the number of DB/subroutine calls

To test:
1 - Apply patch
2 - prove -v t/db_dependent/Circulation.t

Signed-off-by: Amit Gupta <amitddng135@gmail.com>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 0b8f4ec614f8e526f814c1d79a6729f7abcac874)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>