Cleanup: move image depth checks in image/

Signed-off-by: Solomon Hykes <solomon@docker.com>
Remove crashTest.go since the use case is covered by docker-stress

Signed-off-by: Andrew Page <admwiggin@gmail.com>
Merge pull request #7593 from tianon/remove-crashtest

Remove crashTest.go since the use case is covered by docker-stress
Merge pull request #7589 from shykes/cleanup-img-depth

Cleanup: move image depth checks in image/
Merge branch 'master' of github.com:dotcloud/docker into audit

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)