storage: Rework virStorageBackendSCSISerial
Alter the code to use the virStorageFileGetSCSIKey helper to fetch the unique key for the SCSI disk. Alter the logic to follow the former code which would return a duplicate of @dev when either the virCommandRun succeeded, but returned an empty string or when WITH_UDEV was not true. Signed-off-by: NJohn Ferlan <jferlan@redhat.com> ACKed-by: NMichal Privoznik <mprivozn@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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