John Ferlan 2114154922 util: Report error if vhost-scsi device file cannot be found
https://bugzilla.redhat.com/show_bug.cgi?id=1523564

If the vhost-scsi device file cannot be found, the generic error

    "error: An error occurred, but the cause is unknown"

is returned.  Let's add a real error message to make it clear
why the failure occurred.
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