actually build the samples

and fix the resulting breakage (of not compiling them for some time,
that is)

also remove the last casts to FiniteDuration

akka-remote-tests/src/main/scala/akka/remote/testconductor/NetworkFailureInjector.scala

@@ -339,7 +339,7 @@ private[akka] class ThrottleActor(channelContext: ChannelHandlerContext)
           else {
             val microsToSend = (now - d.lastSent) / 1000
             val (s1, s2) = split(d.queue.head, (microsToSend * d.rateMBit / 8).toInt)
-            (d.copy(queue = s2 +: d.queue.tail), toSend :+ s1, Some(((timeForPacket - now).nanos min packetSplitThreshold).asInstanceOf[FiniteDuration]))
+            (d.copy(queue = s2 +: d.queue.tail), toSend :+ s1, Some((timeForPacket - now).nanos min packetSplitThreshold))
           }
         }
       }