Bug 13687: Move hold policy check into CanItemBeReserved

Bug 13687: Move hold policy check into CanItemBeReserved

This way ILS-DI HoldItem and HoldTitle services also benefit from this
check

Test plan:

1/ Define some default holds policies by item type in
/admin/smart-rules.pl
2/ Use ILS-DI HoldItem service and check that those rules are respected
3/ Check that staff and opac hold behaviour is unchanged regarding
these rules.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes tests and QA script. No regressions found,
improves the ILS-DI HoldItem response.
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>