redisClient.end() without flush

Hello,

I'm seing a warning from redis when running test:

node_redis: Using .end() without the flush parameter is deprecated and throws from v.3.0.0 on.
Please check the doku (https://github.com/NodeRedis/node_redis) and explictly use flush.

You can see the method documented here: redis.end(flush)

the flush param now is mandatory, so we need to either add the flush param or to change the .end() for .quit() that allows all pending operations to end.