Update-image page is missing aditional feilds

I understand the need to keep things clean, but today "update-image" page is very limited and only supports minor updates (name/description/public/protected).

It would be beneficial if other missing fields would be added, rather than updating them only from cli,
for example: min disk/ram, architecture.

Also opened new blue prints asking to expose image ownership and permissions on Horizon, being able to change these from within update-image page would also a useful addition.