Bug 21068: Remove NorwegianPatronDB related code

Bug 21068: Remove NorwegianPatronDB related code

Bug 11401 introduced code to support Norwegian national library card.
This code is too specific to be part of Koha as it, it should be a
plugin instead.
Moreover nobody uses it, but a modified version (see comment 3).

Test plan:
Add/edit/delete patron and make sure there are no regressions introduced
by these patches

Signed-off-by: Benjamin Rokseth <benjamin.rokseth@deichman.no>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>