Bug 17927: Fix /holds and /patrons data types

Bug 17927: Fix /holds and /patrons data types

This patch changes current Swagger definitions for patrons and holds to have
data types corresponding to column data types in their database tables.

To test:
1. GET http://yourlibrary/api/v1/patrons/YYY where YYY is existing borrowernumber
2. Observe that numbers / integers are in string data type.
3. Apply this patch
4. Repeat step 1.
5. Observe that numbers / integers are now actually numbers / integers.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>