* Pull image from Quay to avoid Dockerhub limits
CI tests are failing in certain situations due to the new Docker Hub limits on anonymous pulls. Switch
to pulling an equivalent image from Quay.io.
* Use correct layer SHAs
* Use an image with enough older shas to do the test correctly
* Use images we control on Quay for testing
* Use correct SHA for new images
* Use images from a single repo in Quay but with tags
* Use correct nginx image
* Use correct tags in docker-registry test
* Fix incorrect image name in debug message
* Use our busybox image
* Little more alpine image cleanup
* Check minimal API and docker-py versions for all docker_* tests.
* Improve docker_swarm creation/destruction for tests.
* Fail when conditions aren't met.
* Don't hardcode address for advertise_addr.
- Leave swarm at end of test to avoid breaking docker_swarm test.
- Do not update stack to avoid error leaving swarm.
- Put test back in correct group.
