topology command: PoC: run an image with a standalone web-ui + a websocket server

[eguzki]

it'd run an image with a standalone web-ui + a websocket server, and kuadrantctl would feed the WS with current topology state kuadrantctl topology --refresh --web

Follow up work after #102

[jasonmadigan]

will try pick this up later in week, see we can get something going