Enable KVM nesting

[fabiand]

General information

A copy of kubernetes/minikube#2553

• Minishift version: Latest
• OS: Linux
• Hypervisor: KVM

Steps to reproduce

1. Run KubeVirt inside of minishift

Expected

VMs can be launched.

Actual

Does not work - emulation needs to be configured, as nesting is not supported

[fabiand]

kubernetes/minikube#2553 describes he issue pretty good. It's about a few kmods which need to be enabled in the image.
Actually, if the centos image is used, then it's probably just about enabling nesting.

[anjannath]

this should be moved to the centos repo. https://github.com/minishift/minishift-centos-iso