Bug 20310: Adding a pref to control behavior

Bug 20310: Adding a pref to control behavior

If people want to control the redirection, we could add a pref
like ArticleRequestsHostRedirection. If it is not enabled,
the party is over.

Test plan:
Test if redirection stops on a child and host when you disable.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>