qemu-iotests: fix test_stream_partial()
This test is streaming to the top layer using the intermediate image
as the base. This is a mistake since block-stream never copies data
from the base image and its backing chain, so this is effectively a
no-op.
In addition to fixing the base parameter, this patch also writes some
data to the intermediate image before the test, so there's something
to copy and the test is meaningful.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id:
2efa304da38b32d47c120ce728568a589c5a3afc.
1458566441.git.berto@igalia.com
Signed-off-by: Jeff Cody <jcody@redhat.com>