The unittests want qemu-img available now so add that as a dependency
that users need to install before running the tests.
Change-Id: I2169988c653088115c7b388113b5e76e721e2429
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
(cherry picked from commit 2cb56f8b99bb27f2d819fbee38018550e01ea8fb)