Long ago we tried to use Fedora's lokkit utility in order to register
our iptables rules so that 'service iptables restart' would
automatically load our rules.

There was one fatal flaw - if the user had configured iptables without
lokkit, then we would clobber that configuration by running lokkit.

We quickly disabled lokkit support, but never removed it. Let's do
that now.

The 'my virtual network stops working when I restart iptables' still
remains. For all the background on this saga, see:

  https://bugzilla.redhat.com/227011

* src/util/iptables.c: remove lokkit support

* configure.in: remove --enable-lokkit

* libvirt.spec.in: remove the dirs used only for saving rules for lokkit

* src/Makefile.am: ditto

* src/libvirt_private.syms, src/network/bridge_driver.c,
  src/util/iptables.h: remove references to iptablesSaveRules