Bug 12803 [QA Followup] - Allow holiday caching to be disabled for testing purposes

 Bug 12803 [QA Followup] - Allow holiday caching to be disabled for testing purposes

Bug 12803 [QA Followup] - Remove use of C4::Dates

C4::Dates was being included, but not used in the code!

Bug 12803 [QA Followup] - Fix koha-qa.pl errors

Bug 12803 [QA Followup] - Update unit tests due to changes in master

Bug 12803 [QA Followup] - Fix to stop failing unit tests

Bug 12803 [QA Followup] - Remove duplicate 'use' lines

Bug 12803 [QA Followup] - Remove NO_CACHE

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>