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/
remove empty builder folder

Signed-off-by: Victor Vieux <vieux@docker.com>
Merge pull request #7594 from vieux/remove_empty_folder

remove empty builder folder