Bug 17318: Make C4::Matcher::_get_match_keys handle 'norms' param

Bug 17318: Make C4::Matcher::_get_match_keys handle 'norms' param

The current implementation doesn't care about that parameter, and applies
a default normalization rule that seems counter-productive (in general) for
its aleged purpose.

This patch makes it handle the following values for 'norms':

    - upper_case
    - lower_case
    - remove_spaces
    - legacy_default
    - none

They make it call the relevant Koha::Utils::Normalize routines. 'legacy_default'
is used only for backwards compatibility, but could be removed if there's consensus.

To test:
- Run:
  $ prove t/Matcher.t
=> FAIL: most _get_match_keys tests fail
- Apply the patch
- Run:
  $ prove t/Matcher.t
=> SUCCESS: Tests pass!
- Sign off :-D

Sponsored-by: FIT
Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>