Bug 9926 - Missing perl modules in Koha

Bug 9926 - Missing perl modules in Koha

To test:

1) check perl syntax on file
     $ perl -cw ./misc/migration_tools/koha-svc.pl

     you should *not* get 'syntax OK' returned from command

2) apply patch, and install File::Slurp module
      $ sudo cpanm File::Slurp

3) check perl syntax on file
      $ perl -cw ./misc/migration_tools/koha-svc.pl

      you should now get 'syntax OK' returned from command

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: Without File:Slurp 1) complains of missing module,
with module then sintax Ok.
No errors.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Changed module from required to optional. The two files in which
it is used are extraneous from the viewpoint of the average user.