Bug 21031: Apache Rewrite rules don't work for API when using anything but Debian...

Bug 21031: Apache Rewrite rules don't work for API when using anything but Debian package Plack configuration

The Rewrite rules for Apache don't work unless you're using
debian/templates/apache-shared-opac-plack.conf or
debian/templates/apache-shared-intranet-plack.conf.

This patch fixes the Rewrite rules for the non-Plack Debian
Apache configuration templates as well as the standard
Apache configuration file that comes with Koha.

__BEFORE APPLYING__
1. Visit /api/v1/app.pl/api/v1/spec on your git dev install
2. This should display a large page of JSON
3. Visit /api/v1/spec on your git dev install
4. This should generate a 404 error

__APPLY PATCH__

__AFTER APPLYING__
5. Visit /api/v1/app.pl/api/v1/spec on your git dev install
6. This should display a large page of JSON
7. Visit /api/v1/spec on your git dev install
8. This should display a large page of JSON (identical to
the one from earlier steps)

Signed-off-by: Ere Maijala <ere.maijala@helsinki.fi>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Passed QA with few notes posted separately to Bugzilla.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>