[WIP] Redis configuration seems to break. Try some fix.

Somehow, `Redis` cookbook deploys the configuration file
for a newer `Redis` and the `Redis` installed on the sensu server
does not support the parameter written on it.

Try to comment out the configuration to start `Redis`.

see: https://github.com/brianbianco/redisio/pull/150
Modify the redis configuration in order for it to start successfully.

The official redis cookbook somehow deploy the configuration file,
part of whose settings is not supported by the older version redis.

In order to successfully start redis,
this commit patchs the redis configuration file.
Merge pull request #117 from kazu634/sensu-redis-fix

Redis configuration seems to break. Try some fix.