use non-java serializers

adjust samples to use non-java serializers

```[2018-03-16T00:28:38.916Z] [WARN] Using the default Java serializer for class [com.adobe.api.platform.runtime.mesos.ReconcileTaskState] which is not recommended because of performance implications. Use another serializer or disable this warning using the setting 'akka.actor.warn-about-java-serializer-usage'```