Ability to provision harvester using new qcow images

[ibrokethecloud]

The PR introduces a new mode of provisioning vagrant for testing purposes using the new install mode qcow images.

Related to: harvester/harvester#2198

[irishgordo]

This is cool and exciting!
I was noticing that we may want to mention that there is an underlying binary requirement of having:
sudo apt install cloud-image-utils
As well as a way to maybe locally build a .qcow2 image?
I was noticing when running ./ipxe-examples/vagrant-qcow2-harvester/setup_harvester.sh it seems to be hunting for:

TASK [download Harvester media] ********************************************************************************************************************************************************************************
fatal: [localhost]: FAILED! => changed=false 
  dest: ../disks/box.img
  elapsed: 0
  msg: Request failed
  response: 'HTTP Error 404: Not Found'
  status_code: 404
  url: https://releases.rancher.com/harvester/master/harvester-master-amd64.qcow2

[ibrokethecloud]

For now i am running the harvester build locally from my branch which has the new install mode.

Depends on: harvester/harvester-installer#303

We should merge this once v1.1.0 is out as that will publish the new qcow artifacts.