Support to specify a service-specific IP address

[FraBle]

The registration of a service with Consul can include a service address (docs).
In my use case I have different docker containers, one for Consul (server and agent), one for my Dropwizard service with your dropwizard-consul bundle.
I opened an issue for consul-client by OrbitzWorldwide #106 in which they describe how it is possible to pass the service address as a parameter by using a registration builder.
If dropwizard-consul would adapt this, it would remove the restriction, that the Consul agent and Dropwizard service are running on the same machine (e.g. in Docker scenarios).

[jplock]

I think I actually had this at one point, then decided to remove it. I'll see what I can do.

[FraBle]

I currently work on a patch/feature for a pull request. I would submit it soon. Maybe you can have a look at it later.

[jplock]

If you can submit a PR I'll happily review it. Thanks!