[WIP] Add support for applying a Config with set of resources via kubecfg

Discussion: https://github.com/GoogleCloudPlatform/kubernetes/issues/1905
That's just part of the kubecfg pattern - since this needs to be rebased on top of kubectl it'll probably look a lot cleaner (since kubecfg is not long for this world)

----- Original Message -----
> > @@ -333,6 +346,32 @@ func getPrinter() kubecfg.ResourcePrinter {
> >  	return printer
> >  }
> >  
> > +func executeConfigRequest(method string, clients configapi.ClientMappings)
> > bool {
> > +	if method != "apply" {
> 
> Do you expect to support more methods in the future?
> 
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/GoogleCloudPlatform/kubernetes/pull/1958/files#r19259073