Bug 17342: (bug 17262 follow-up) fix the way to retrieve memcached config from apache

Bug 17342: (bug 17262 follow-up) fix the way to retrieve memcached config from apache

The problem is that the memcached configuration variables are extracted
from the apache configuration file incorrectly so you get
'"127.0.0.1:11211"' including double quotes as the servers parameter to
memcached.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Note this only applies on 3.22.x but it does fix the problem
Definitely needed for 3.22.12

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>