Previously we had TestNodePort, which tested basic NodePort behavior,
plus Test{Enable,Disable}LocalhostNodePorts{IPv4,IPv6} to test the
behavior of --localhost-nodeports under IPv4 and IPv6, plus
TestDisableLocalhostNodePortsIPv4WithNodeAddress to test
--nodeport-addresses.
Merge all of these together into TestNodePorts, and use
runPacketFlowTests to check the results rather than
assertIPTablesRulesEqual.
The packet tracer is not full-featured enough to be able to check the
"anti martian packet spoofing" rule, so we check the iptables dump for
that manually.
(This also fixes the --localhost-nodeport tests to use the same IP
ranges as most of the other tests now.)
ff5f5bc161