restructure remoting

- remove Remote, incorporate its few fields into RemoteActorRefProvider
- rename RemoteSupport to RemoteTransport to sync up with conf and
  the way we talk about it
- remove LocalAddress/RemoteAddress etc. and just have a final case
  class Address(protocol, system, host, port)
- split netty settings out or RemoteSettings into NettySettings
- split out from NettyRemoteSupport.scala: Server.scala, Client.scala,
  Settings.scala

plus a few fixes, including using the contextClassLoader when loading
the provider for ActorSystemImpl

akka-remote/src/multi-jvm/scala/akka/remote/AbstractRemoteActorMultiJvmSpec.scala

@@ -21,8 +21,8 @@ trait AbstractRemoteActorMultiJvmSpec {
     case (idx, host) =>
       ConfigFactory.parseString("""
         akka {
-          remote.server.hostname="%s"
-          remote.server.port = "%d"
+          remote.netty.hostname="%s"
+          remote.netty.port = "%d"
         }""".format(host, 9990+idx, idx)) withFallback commonConfig
   }
 }