IPVS: Add Generic Netlink configuration interface

This is the third iteration of the IPVS Netlink interface, this time
with only a small fix for a typo found by Thomas Graf. If there are no
further major issues, can this be applied?

The two patches add a Generic Netlink interface to IPVS while keeping
the old get/setsockopt interface for userspace backwards compatibility.
The motivation for this is to have a more extensible interface for
future changes, such as the planned IPv6 support.

An ipvsadm that already uses the new interface is available here:

http://sixpak.org/vince/google/ipvsadm/
(by Vince Busam)

Old ipvsadms continue to work with this change.
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