Bug 12000: ensure that hold resumption dates can be set only to future dates

This patch makes the datepickers for the hold resumption date
(AKA the hold suspend until date) field only permit dates in
the future to be selected in the staff interface checkout page
and hold list pages.  This makes these pages consistent with
the OPAC and the patron details page in the staff interface.

To test:

[1] Ensure that AutoResumeSuspendedHolds and SuspendHoldsIntranet
    are enabled.
[2] Go to the checkout page for a patron that has at least one hold
    request.
[3] Verify that the datepicker for the hold suspend until
    date field only permits choosing a date in the future.
[4] Go to the page listing hold requests for a title.
[5] Verify that the datepicker for the hold suspend until
    date fields only permit choosing a date in the future.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described, passes all tests and QA script.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 7378d488414d1859c75f0d3b40e5ce99cde67cb7)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>