This is much better than downloading the builds with curl, because
Docker is intelligent about only pulling what it needs.
We use tagged versions of dind for the released version, and dind-master
for a master build.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
Add a run_multiversion.sh script that downloads a variety of Docker
engines and runs the integration tests against each of them.
Skip some of the tests when running with Docker 1.6.0. It has a bug that
prevents these tests from completing successfully.
Fixes#751
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>