Add two new configurations for PF.

icmpblock.pf: block ALL icmp messages ONLY
nat.pf: Simple NAT which passess all traffic.  Shows performance of
	state creation.
Add basic performance data from the hash update comparison.
Add results of comparing performance with and without VIMAGE in the
kernel.
Add configuration files for testing with PF using the pkt-gen packet
generator.  No filtering is in place for this test.
Lengthen the time that the test runs from 9 to 30 seconds.
Add stats collection to the test on the DUT.