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Cassandra cannot connect to host in testkit

See original GitHub issue

When using an embedded Cassandra in test in lagom 1.5.0-M3, I get logged errors about failure to connect to a host. My tests still pass, but the errors look scary. 😃

Error:

[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 1000 milliseconds
[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 1000 milliseconds
[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 2000 milliseconds
[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 2000 milliseconds
[error] a.c.s.PersistentShardCoordinator - Failed to persist event type [akka.cluster.sharding.ShardCoordinator$Internal$ShardRegionRegistered] with sequence number [1] for persistenceId [/sharding/TicketEntityCoordinator].
java.util.concurrent.ExecutionException: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried)
	at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:531)
	at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:492)
	at akka.persistence.cassandra.package$ListenableFutureConverter$$anon$2.$anonfun$run$2(package.scala:25)
	at scala.util.Try$.apply(Try.scala:209)
	at akka.persistence.cassandra.package$ListenableFutureConverter$$anon$2.run(package.scala:25)
	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried)
	at com.datastax.driver.core.RequestHandler.reportNoMoreHosts(RequestHandler.java:265)
	at com.datastax.driver.core.RequestHandler.access$1200(RequestHandler.java:62)
	at com.datastax.driver.core.RequestHandler$SpeculativeExecution.findNextHostAndQuery(RequestHandler.java:357)
	at com.datastax.driver.core.RequestHandler.startNewExecution(RequestHandler.java:138)
	at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:120)
	at com.datastax.driver.core.SessionManager.execute(SessionManager.java:700)
	at com.datastax.driver.core.SessionManager.executeAsync(SessionManager.java:144)
	at akka.persistence.cassandra.session.scaladsl.CassandraSession.$anonfun$executeWrite$1(CassandraSession.scala:264)
	at scala.concurrent.Future.$anonfun$flatMap$1(Future.scala:303)
	at scala.concurrent.impl.Promise.$anonfun$transformWith$1(Promise.scala:37)
[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 4000 milliseconds
[error] c.d.d.c.ControlConnection - [Control connection] Cannot connect to any host, scheduling retry in 4000 milliseconds

The tests that report this are in ticket/ticket-impl/src/test/scala/com/github/erip/ticket/impl/TicketServiceSpec.scala.

Reproducer: https://github.com/erip/ticketing-service after switching plugin version from 1.4.8 to 1.5.0-M3.