Use dockerctl post_start_hooks to clean iptables

iptables -D itself is buggy and doesnot always perform cleanup correctly
also we need to cleanup not only DOCKER chain, but also FORWARD
this is already done in dockerctl post_start_hooks as solution
for removing stale iptables rule after upgrade

We need to perform invokation of this script after
container is started because dockerctl uses docker inspect to
fetch relevant data for containers

Change-Id: Ib568fb14bc78d40c214d922907d7bb3adb213eee
Closes-Bug: 1349287
Merge "Use dockerctl post_start_hooks to clean iptables"