add --cap-add=NET_ADMIN to make a new network device

inspired by #9452

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)

Signed-off-by: Sven Dowideit <SvenDowideit@docker.com>
Add a fuse example, combining both SYS_ADMIN and --device

inspired by #9448 and #9487

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)

Signed-off-by: Sven Dowideit <SvenDowideit@docker.com>
Flush stdin from within chroot archive

This makes sure that we don't buffer in memory and that we also flush
stdin from diff as well as untar.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #9522 from SvenDowideit/add-some-cap-add-examples

Add some cap add examples
Merge pull request #9573 from crosbymichael/flush-stdin

Flush stdin from within chroot archive