This will enable the testing of high offsets without
wasting a lot of disk space, and does not impact the
previous tests.

mkimg and mkqcow2 are added to libqos for other tests.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Acked-by: NStefan Hajnoczi <stefanha@redhat.com>
Message-id: 1426274523-22661-2-git-send-email-jsnow@redhat.com