Diffing a container yielded some extra changes that come from the
files/directories that we mount inside the container (/etc/resolv.conf
for example). To avoid that we create an intermediate snapshot that has
these files, with this we can now diff the container fs with its parent
and only get the differences that were made inside the container.
Signed-off-by: Djordje Lukic <djordje.lukic@docker.com>
207c4d537c