delete operation should delete profiles/<profile> folder rather than only delete config.json file

[perrywang]

Problem
delete operation should delete whole folder profiles/<profile>
The exact command to reproduce the issue:
execute minikube delete, only profiles/<profile>/config.json get deleted and an empty folder profiles/<profile> left.

[tstromberg]

Good find. That approach sounds fully reasonable. I'd be happy to review any PR that makes it happen.

cmd/minikube/cmd/delete.go is the file that requires an update. After it deletes the profile file, it should calculate the profile directory and attempt to remove it.

[fenglixa]

I would like to provide PR for this issue. Thanks @tstromberg @perrywang

[LuChenjing]

As complementary,
For minikube vm driver "none" in Linux, the whole folder profiles/ will be deleted after executing "minikube delete",
but for minikube vm driver "virtualbox" in Windows, it won't be deleted, and also the config.json file inside. Only the "disk.vmdk" and folder in machines/profile/ will be removed.

[kumarom]

@medyagh shouldn't we also cleanup stale context/user/cluster from ~/.kube/config ? Or is it already taken care of..