Author: Juan Carrera
MDL-66546 caching: Add support to unix:// connections to redis.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=63a7ce510837dec4b7719fb61da4946d33f93873
http://github.com/moodle/moodle/commit/63a7ce510837dec4b7719fb61da4946d33f93873
+ 4.4 en [server_desc,cachestore_redis]
+ 4.4 en [server_help,cachestore_redis]
+ 4.4 en [test_server_desc,cachestore_redis]