Bug 16330: Add routes to add, update and delete patrons

Bug 16330: Add routes to add, update and delete patrons

This patch adds support for add, edit and delete patrons via REST API.

GET  /api/v1/patrons                   Get patron list from params
GET  /api/v1/patrons/<borrowernumber>  Get single patron
POST /api/v1/patrons                   Create a new patron
PUT  /api/v1/patrons/<borrowernumber>  Update data about patron
DEL  /api/v1/patrons/<borrowernumber>  Delete a patron

Revised Test plan:
1) Apply this patch
2) Run tests perl t/db_dependent/api/v1/patrons.t
3) Add a user with proper rights to use the REST API
4) play with your favourite REST client (curl/httpie, etc.):
   Authenticate with the user created above and get a CGISESSION id.
   Use the CGISESSION to add, edit and delete patrons via the API.
5) Use PUT /patrons/<borrowernumber> for a patron without borrowers
   flag. This should go into pending patron modification status and
   needs to be accepted by a librarian.

Please note there is no validation of body input in PUT/POST other
than branchcode,category,userid,cardnumber.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Benjamin Rokseth <benjamin.rokseth@kul.oslo.kommune.no>

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>