[feature request] alternative registry to txt and aws, like redis or etcd ?

[mcarbonneaux]

What would you like to be added:

The only available registry are TXT, AWS Dynamo or AWS Service Discovery. in reality when your are not on AWS the only available option is TXT...

Can you add an alternative local registry option like redis, etcd, consul or equivalent?

Why is this needed:

In a non-aws environment (like on-premises), it is useful to not store metadata in TXT fields to avoid overloading DNS with changes.
In an on-premises cluster, it would be useful to store metadata in a local redis/ectd/consul cluster for example.