We don't need:
* a separate Koha::Installer module when we already have
C4::Installer
* the tests as they are actually modifying the DB structure
without rolling back
* An unecessary complicated subroutine, just make is simple
WNC amended patch: Remove change to Koha.pm
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Signed-off-by: Nick Clemens <nick@bywatersolutions.com> Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>