Istioctl summary doc

Team,

I created a istioctl summary doc to summarize overall functions of istioctl including some of the functions being proposed. This is where I would like to see istioctl headed. It was reviewed briefly at the UX group mtg today. Please take a look and provide your feedback:

https://docs.google.com/document/d/1nmBv2W_PUw8mgw3XoAhGIm3R-1lUIxHrF3j3OQj4O1E/edit

Thanks,

Lin