Move the download of docker to top of dockerfile

We need to do this because it's a big dep.  While we remove this
recursive dep this is the best that we can do right now.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Add integration test pkg

This integration pkg adds a framework for writing integration tests
aginst the libcontainer APIs

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #226 from crosbymichael/add-tests

Add integration test framework