Start porting Akka.Remote.TestKit

Out of time for the day. This is as far as I've got.

From the bits I've gone through looks like we will need some features implemented in Akka.Remoting and Helios.

Still not clear on the bigger picture. i.e what/if we could replace with remoting, how multiple JVMs are initialised.
Going to spend some time getting my head around that.