testing infrastructure, issue #1800: Refactor docker testing using Docker in Docker
docker-ci 0.35. Push docker coverage and testing into docker-ci production. Update docker nightlyrelease
docker-ci 0.36. Patch hack/dind with latest code for nightly release to work.
docker-ci 0.37. Patch hack/dind with latest code for docker-test.
docker-ci 0.40. Migrate docker-ci to Digital Ocean.
docker-ci 0.4.5: Sync tests with progress in docker and docker-registry. Use revamped shiny DinD.