Add cgroup namespce option to minijail0 manpage

The new -N option wasn't yet added to the manpage.  It utilizes the new
cgroup namespace feature of v4.6+ Linux kernels.

BUG=none
TEST=man ./minijail0.1

Signed-off-by: Dylan Reid <dgreid@chromium.org>
(cherry picked from commit 87e5851ba5eee9c8ff57c37aefa09f089f75c935)

Change-Id: I55506830cee475d1fb429d7583ef4e8ff389474b
Reviewed-on: https://chromium-review.googlesource.com/360331
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>
1 file changed