Preserve and report stderr from virsh
Preserve and report stderr from virsh

Prior to this, stderr from virsh was omitted from output when running
functional tests. Unfortunately, this is the most meaningful part.

Signed-off-by: Stu Gott <74ba1dce436e5ad4933d948f15008ab671904a40@redhat.com>

kubevirt/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt