Minikube should (build and) use the latest localkube binary

[kubernetes]

Minikube should (build and) use the latest localkube binary

[dlorenc]

Here's what I'm thinking here:

Building minikube from scratch should do the following:

• build localkube for linux/amd64 with cgo enabled
• run go-bindata to add the localkube binary to the minikube source
• build minikube for the target platform

Then when you start the cluster, minikube can transfer the file to the VM from memory.

This has a few problems though:

• building localkube is slow
• cross compiling with cgo is hard

So we could have a second, "quick" compile mode for minikube that uses a separate build of localkube instead of building one from head.

Then whenever someone changes localkube, we'll update the separate build of localkube as well.

Thoughts?

[dlorenc]

Closed with #66