Removed the option to pass section to redis info command.

Removed the option to pass section to redis info command. Option is no longer available and throws an exception when used.

We have this fix running in production on redis version: 2.2.12

passing any args from redis-cli such as INFO 'default' as described here http://redis.io/commands/info leads to an error.

The only possible command seems to be INFO with no parameters.  This is mirrored in the ruby gem.