autotest/virt-test — pull request #1932 by waynesun09 (2014-12-24 09:03:33+00:00)
Title: utils_test.libvirt: Add snapshot atrribute for setting vm disk

In domain disk xml, the snapshot attribute accept 'no', 'internal'
and 'external' value, which used to allow or deny doing certain type
of snapshot on the disk.

Signed-off-by: Wayne Sun