Support to specify a service-specific IP address

[FraBle]

I'm running several docker containers. One is used for Consul, running server and agent on the same machine. Another one is used for a Java service (Dropwizard) using the Java Docker image. To connect my Java service with Consul, I use dropwizard-consul. It is based on consul-client.

Since the Java container has its own IP address, but does not propagate it to Consul as service address, I don't have a valid service registration.
Consul uses the agents address as fallback, which is wrong in my case.

However, it's possible to specify a service address:

The address field can be used to specify a service-specific IP address. By default, the IP address of the agent is used, and this does not need to be provided.

(duplicate of #28, but it has never been reconsidered yet)

[gjesse]

You can already do this, though it's a little indirect. Something like

        Registration.RegCheck check = Registration.RegCheck.http("http://check/path", 10);

        Registration registration = ImmutableRegistration
                .builder()
                .port(1234)
                .address("192.168.0.24")
                .check(check)
                .name("name")
                .id("id")
                .addTags("tag", "tag2")
                .build();

        client.agentClient().register(registration);

I think the general use case is that people run the agent locally on the machine, so I'm guessing this is not a very common use case, and therefore probably not worth adding another set of overloaded registration methods to AgentClient

[rickfast]

I'm inclined to agree. There's already more register methods than I'd like. Going to close this for now.

[FraBle]

I took @gjesse advice and added the missing functionality to smoketurner/dropwizard-consul (Pull Request). Thank you!