Revert "Merge pull request #2339 from phyber/iptables-check"
Revert "Merge pull request #2339 from phyber/iptables-check"

This reverts commit 820deef78e53c49f13797a93537325a4b8d53014, reversing
changes made to 19e372a98f736c48e65563db5d7a474fa42d94b4.

Signed-off-by: Arko Dasgupta <5ace5199265f07060a7b6fe8a48858e91c7682a6@docker.com>

docker/libnetwork,mahak/libnetwork,docker/libnetwork,docker/libnetwork,mahak/libnetwork,mahak/libnetwork