Use a unique pvc/pod name for guestfs test
Use a unique pvc/pod name for guestfs test

We have a flake where the pod is terminating -- this is likely due to
the name conflict with another test. This name is more appropriate, too.

Signed-off-by: Maya Rashish <309f5d63d2311d00fe13deb09dd851fb2714413c@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt