* qemud/iptables.[ch]: add code for managing iptables
rules.
* qemud/Makefile.am: add iptables.[ch].
* qemud/qemud.c: add and remove iptables rules as
appropriate.
* qemud/conf.c: when starting a guess, add a rule
allowing it to forward packets across the networks
bridge.
* qemud/internal.h: add iptables context ptr
* configure.in: add --with-iptables-dir and
--with-iptables-prefix to allow us to put our rules
in a chain with the given prefix and save the rules
in files in the given dir so as to integrate with
the proposed "service iptables restart" solution
in:
https://bugzilla.redhat.com/227011
* configure.in: add --disable-bridge-params, check
for libsysfs and various kernel headers
* bridge.[ch]: add code for managing bridges
* qemud/Makefile.am: add bridge.[ch] and link against
libsysfs if enabled.
* qemud/conf.c: add support for bridge config.
* qemud/internal.h: add various bridging bits
* qemud/qemud.c: implement qemudStartNetworkDaemon()
and qemudShutdownNetworkDaemon().
