Bug 34041: z3950 responder additional options not coming through properly

Bug 34041: z3950 responder additional options not coming through properly

This patch adds the <config> node that the z3950 responder starter script is looking for in the z3950/config.xml to the example code.

To test:
 - verify that the <config> </config> is around the commented z3950_additional_options suggestion in the etc/z3950/config.xml file
 - copy the config stanza to the live file: /etc/koha/sites/kohadev/z3950/config.xml
 - restart_all
 - ps aux | grep z3950
 - confirm the script has restarted
 - confirm the options: --add-item-status k -t 5 have been passed through

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>