libvirt-machine: Display I/O errors to the user
When libvirt encounters I/O errors like 'not enough space', it suspends the VM and notifies Boxes. Boxes doesn't report this error to the user. This commit addresses this.
When libvirt encounters I/O errors like 'not enough space', it suspends the VM and notifies Boxes. Boxes doesn't report this error to the user. This commit addresses this.