O_FORWARD_IP is only action which depends from the result of lookup of
dynamic rules. We are doing forwarding in the following cases:
o For the simple ipfw fwd rule, e.g.

fwd 10.0.0.1 ip from any to any out xmit em0
fwd 127.0.0.1,3128 tcp from any to any 80 in recv em1

o For the dynamic fwd rule, e.g.

	fwd 192.168.0.1 tcp from any to 10.0.0.3 3333 setup keep-state

       When this rule triggers it creates a dynamic rule, but this

dynamic rule should forward packets only in forward direction.

o And the last case that does not work before - simple fwd rule which
triggers when some dynamic rule is already executed.

PR: kern/147720, kern/150798
MFC after: 1 month