Fix chroot untar for zero padded archive from slow reader

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Running a container that links to a container with --net host
should throw an error.

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Merge pull request #9567 from jfrazelle/8333-net-link-error

Throw error when container links to --net host container
Merge pull request #9539 from flynn/chroot-untar-empty-archive-slow

Fix chroot untar for zero padded archive from slow reader