sheepdog: cleanup find_vdi_name
This makes 'filename' and 'tag' constant variables, and renames 'for_snapshot' to 'lock' to clear how it works. Signed-off-by: NMORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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