Bug 9761: Unit tests for ConfirmFutureHolds changes

Bug 9761: Unit tests for ConfirmFutureHolds changes

Adds tests for CheckReserves with lookahead parameter.
Adds tests for AddReturn with regard to future reserve messages.
The following test cases are added, resulting in 8 new tests:
a) Add a reserve without date, CheckReserve should return it
b) Add a reserve with future date, CheckReserve should not return it
c) Add a reserve with future date, CheckReserve should return it if lookahead
   is high enough
d) Check ResFound message of AddReturn for future hold

Test plan:
Run the test. No fails?

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>