RemoteDataflowQueue class is a DataflowChannel<T>
Attempt to extract responsibility of maintaining LocalHost (serialization context) from NettyTransportProvider.
Local change that breaks API. First step to make code more testable.
Make RemoteDataflowQueue fail in explicit way.
RemoteDataflowQueue basic getVal functionality.
RemoteDataflowQueue basic leftShift functionality.
Tests fix: RemoteDataflowVariable
TODO: RemoteDataflowVariable is not aware of bound status.