Prior to this change, the seed VM was provisioned using the
stackhpc.livirt-vm role with become=true. This resulted in the cached
image being owned by root. The infra VM provisioning uses
stackhpc.libvirt-vm without become=true. If an infra VM uses the same
image as the seed, this can lead to permission denied errors when
downloading a new image of the same name.

This change adds a workaround to fix up the ownership of the cached
image during infra VM provisioning to avoid this issue.

This change also drops become=true from stackhpc.libvirt-vm during seed
VM provisioning, and adds the same workaround there.

Story: 2009277
Task: 43534

Change-Id: Iade0d74cdb398365a567dbdc4b23de2416f3726d