Redis checks not working

[seanhamlin]

Executing a test against a site with an env var REDIS_HOST defined, I do not see a redis section in the output

curl -s https://test-site.com/.lagoonhealthz -A 'StatusCake'
{"check_db":"pass","check_nginx":"pass","check_php":"pass"}

I am also wondering if we need to update the response from Redis https://github.com/amazeeio/healthz-php/blob/master/src/Check/CheckRedis.php#L48 as my understanding is that the newer version of the phpredis library does not use this response (just a bool now).