Kind support scaling vehicles up and down

[mhl787156]

While kind supports multi-node, it does not support dynamically adding and removing new nodes - see here. However in that post they suggest adding and removing taints or labels might be a good way to simulate it.

Out of scope for right now, but would propose the following. On start up, user can provide a --max-vehicles N parameter to ./starling start kind. This creates a kind config with the set number of vehicles all with no labels

Then on ./starling simulator start, each node about to be used gets given its vehicle label and containers get scehduled upon them.