Add Support for Multiple Sentinel Instances

Now that there is support for multiple Redis instances, there should also be the ability to add multiple Sentinel instances.

Requesting a feature request to support multiple Sentinel instances

[v6]

// , I suspect that you have an example use case in mind. :)

@v6 https://i.stack.imgur.com/Citcm.png and example number 2 in https://redis.io/topics/sentinel

[anthonysomerset]

to me this is not about running multiple sentinel instances (on the same box) but more about being able to monitor 2 individual redis master/slave clusters, e.g. I am looking at deploying 3 nodes, A, B, C each with redis and sentinel, i'd like to run 2 redis instances on each node on ports 6379 and 6380 respectively, i'd like node A to be master for 6379 and node C to be master for 6380