remove async-dns implementation, and add tests for Kubernetes using DNS

[eed3si9n]

Ref lightbend/reactive-cli#177
Trying to reproduce the issue.
Fixes #93

[eed3si9n]

Still seeing

[INFO] [12/07/2018 16:24:18.891] [default-akka.actor.default-dispatcher-16] [akka.tcp://default@10.130.4.13:10000/system/bootstrapCoordinator] Looking up [Lookup(bootstrap-dns-demo,Some(management),Some(tcp))]
[WARN] [12/07/2018 16:24:21.911] [default-akka.actor.default-dispatcher-17] [akka.tcp://default@10.130.4.13:10000/system/bootstrapCoordinator] Resolve attempt failed! Cause: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://default/system/IO-DNS#2009517534]] after [3000 ms]. Message of type [akka.io.dns.DnsProtocol$Resolve]. A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

[eed3si9n]

Still seeing

[INFO] [12/07/2018 18:28:54.757] [default-akka.actor.default-dispatcher-16] [akka.tcp://default@10.130.4.29:10000/system/bootstrapCoordinator] Looking up [Lookup(bootstrap-dns-demo-internal.reactivelibtest1.svc.cluster.local,Some(management),Some(tcp))]
[WARN] [12/07/2018 18:28:56.607] [default-akka.actor.default-dispatcher-3] [akka.tcp://default@10.130.4.29:10000/system/bootstrapCoordinator] Resolve attempt failed! Cause: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://default/system/IO-DNS#-199650001]] after [3000 ms]. Message of type [akka.io.dns.DnsProtocol$Resolve]. A typical reason for `AskTimeoutException` is that the recipient actor didn't send a reply.

[eed3si9n]

To clarify, I am seeing Some(management) in Looking up [Lookup(bootstrap-dns-demo-internal.reactivelibtest1.svc.cluster.local,Some(management),Some(tcp))]. This would fail because the port that we have it set up here is akka-mgmt-http.

In theory

  management {
    cluster {
      bootstrap {
        contact-point-discovery {
          port-name = akka-mgmt-http
        }
      }
    }
  }

should've been picked up from akka-cluster-bootstrap/src/main/resources/rp-tooling.conf.

[eed3si9n]

Finally got it to lookup akka-mgmt-http, but still not working.

[INFO] [12/11/2018 09:07:10.583] [default-akka.actor.default-dispatcher-3] [akka.tcp://default@10.130.4.132:10000/system/bootstrapCoordinator] Looking up [Lookup(bootstrap-demo-kubernetes-dns-internal.reactivelibtest1.svc.cluster.local,Some(akka-mgmt-http),Some(tcp))]
[WARN] [12/11/2018 09:07:13.603] [default-akka.actor.default-dispatcher-20] [akka.tcp://default@10.130.4.132:10000/system/bootstrapCoordinator] Resolve attempt failed! Cause: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://default/system/IO-DNS#1521988542]] after [3000 ms]. Message of type [akka.io.dns.DnsProtocol$Resolve]. A typical reason for AskTimeoutException is that the recipient actor didn't send a reply.

[eed3si9n]

I am thinking #93 needs to happen for DNS to work.
The correct message is being sent but probably the other side is not interpreting the new style of message akka.io.dns.DnsProtocol$Resolve.