An inspection of the graph package showed this function to be way out of place.
It is only depended upon by the daemon code. The function prepares a top-level
readonly layer used to provide a consistent runtime environment for docker
images.
Signed-off-by: Stephen J Day <stephen.day@docker.com>
Upstream-commit: b7f887a9a24a2df61fa53612ae42b7e9d62fe858
Component: engine