[libvirt] [PATCH] Fix lv scanning with encrypted volumes

See https://bugzilla.redhat.com/show_bug.cgi?id=470693 Using ':' as a delimiter for the lvs command isn't reliable, since it looks like encrypted volume groups have a colon in the physical device name, which throws of the regex. The attached patch changes the delimiter to ','. Maintains existing behavior for me, just waiting on confirmation from the reporter that this indeed does the job. Thanks, Cole