Bug 19096: Adjusts unit tests

Bug 19096: Adjusts unit tests

The subroutines listed in the former patch are extensively tested in
Biblio.t, TransformKohaToMarc.t and TransformMarcToKoha.t.
These tests do no longer use new frameworks to add mappings.

In Biblio.t and TransformMarcToKoha.t we also test passing an individual
framework code (for an empty framework) to see if Default is still used.
Note that this parameter will be removed later on.

In Items.t the cache keys MarcStructure-0- and MarcStructure-1- are not
touched, so they do not need to be cleared. The cache key
default_value_for_mod_marc- should be used without framework now.
Similar adjustments in Items/AutomaticItemModificationByAge.t and
Reserves.t.

Furthermore the subtest for _build_default_values_for_mod_marc in Items.t
is adjusted since framework is no longer relevant. The biblio record with
items is created in a new framework, but the mappings from Default are
consulted.

Test plan:
Run all adjusted unit tests.

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>