Since `cirros.tar.gz` only existed to test `docker import`'s display and
presence in `docker events`, we can instead just use `docker export`
piped directly to `docker import` to achieve the same goal without
another external dependency besides `busybox` (which we already have).
While I was at it, I updated `TestImportDisplay` to also test that the
imported image actually runs successfully as well (so we're testing the
full import round-trip).
Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
Common patterns:
- Multiple images were built with same name but only one cleanup.
- Containers were deleted after images.
- Images not removed after retagging.
Signed-off-by: Tõnis Tiigi <tonistiigi@gmail.com> (github: tonistiigi)
