The vendor information used to come from parted which reports virtio blk
devices as 'Virtio Block Device'. The sysfs vendor entry has always been
0x1af4 which isn't very descriptive. So in disk.description check for
the exception and return "Virtio Block Device". disk.vendor is left
as-is, only the user friendly description is modified.
Resolves: rhbz#1242117
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/174