Bug 12026: Adds auto-provisioning to shibboleth

Bug 12026: Adds auto-provisioning to shibboleth

- Adds the option to map shibboleth attributes to koha user columns
  and allows mapping to auto create non-existant users

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Olli-Antti Kivilahti <olli-antti.kivilahti@jns.fi>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>