virtctl show message about hotplug add/remove volume
virtctl show message about hotplug add/remove volume

Make error message consistent between hotplug add/remove volume

Signed-off-by: Alexander Wels <4461831985d22a9cb5876dee61b80a0160999dcb@redhat.com>

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