netfilter: nfnetlink_queue: add security context information

netfilter: nfnetlink_queue: add security context information

This patch adds an additional attribute when sending
packet information via netlink in netfilter_queue module.
It will send additional security context data, so that
userspace applications can verify this context against
their own security databases.

Change-Id: I1f8e8bea84e05abfc78808f6fccc513aa5bb0a9f
Signed-off-by: Roman Kubiak <r.kubiak@samsung.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: jooseong lee <jooseong.lee@samsung.com>