Ensure that kubectl get works with downstream resources

Commit a198a62 introduced a dependency linking the Kube API versions to the implementation
of watching resources used in kubectl.  This removes that dependency and allows conversion
to be handled by the ObjectConvertor defined in the kubectl factory.

@lavalamp review please
Do we need both outputVersion and the mapping? It's ok if we do, but it'd be nice to not need both. Getting to be a lot of parameters.