minijail0: unbreak chroot and marshalling

1) Parse opts for chroot and bind
2) Serialize/deserialize chroot properly

BUG=chromium-os:21665
TEST=security_Minijail0

Change-Id: Ic99a40718a9c3ff72561f518179155fb502eef96
Signed-off-by: Elly Jones <ellyjones@chromium.org>
Reviewed-on: http://gerrit.chromium.org/gerrit/10507
Reviewed-by: Will Drewry <wad@chromium.org>
2 files changed