network: implement virNetworkUpdate for bridge_driver
network: implement virNetworkUpdate for bridge_driver

Call the network_conf function that modifies the live/persistent/both
config, then refresh/restart dnsmasq/radvd if necessary, and finally
save the config in the proper place(s).

This patch also needed to uncomment a few utility functions that were
added inside #if 0 in the previous commit (to avoid compiler errors
due to unreferenced static functions).

siboulet/libvirt-openvz,fabianfreyer/libvirt,jfehlig/libvirt,jfehlig/libvirt,shugaoye/libvirt,emaste/libvirt,trainstack/libvirt,rlaager/libvirt,agx/libvirt,siboulet/libvirt-openvz,eskultety/libvirt,taget/libvirt,olafhering/libvirt,iam-TJ/libvirt,agx/libvirt,eskultety/libvirt,jfehlig/libvirt,libvirt/libvirt,jeckersb/libvirt,libvirt/libvirt,andreabolognani/libvirt,trainstack/libvirt,novel/fbsd-libvirt,eskultety/libvirt,trainstack/libvirt,VenkatDatta/libvirt,rlaager/libvirt,novel/fbsd-libvirt,iam-TJ/libvirt,libvirt/libvirt,shugaoye/libvirt,elmarco/libvirt,warewolf/libvirt,zippy2/libvirt,jeckersb/libvirt,andreabolognani/libvirt,taget/libvirt,novel/fbsd-libvirt,bjzhang/libvirt,warewolf/libvirt,jardasgit/libvirt,jeckersb/libvirt,zhlcindy/libvirt-1.1.4-maintain,warewolf/libvirt,iam-TJ/libvirt,emaste/libvirt,agx/libvirt,cbosdo/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,siboulet/libvirt-openvz,novel/fbsd-libvirt,crobinso/libvirt,fabianfreyer/libvirt,eskultety/libvirt,siboulet/libvirt-openvz,emaste/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,novel/fbsd-libvirt,trainstack/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,trainstack/libvirt,jfehlig/libvirt,rlaager/libvirt,rlaager/libvirt,olafhering/libvirt,novel/fbsd-libvirt,nertpinx/libvirt,fabianfreyer/libvirt,warewolf/libvirt,zippy2/libvirt,agx/libvirt,taget/libvirt,elmarco/libvirt,siboulet/libvirt-openvz,emaste/libvirt,fabianfreyer/libvirt,trainstack/libvirt,emaste/libvirt,rlaager/libvirt,datto/libvirt,elmarco/libvirt,cbosdo/libvirt,bjzhang/libvirt,trainstack/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,warewolf/libvirt,nertpinx/libvirt,datto/libvirt,novel/fbsd-libvirt,bjzhang/libvirt,warewolf/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,datto/libvirt,nertpinx/libvirt,taget/libvirt,emaste/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,elmarco/libvirt,cbosdo/libvirt,datto/libvirt,jeckersb/libvirt,taget/libvirt,nertpinx/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,crobinso/libvirt,jeckersb/libvirt,iam-TJ/libvirt,shugaoye/libvirt,cbosdo/libvirt,zippy2/libvirt,jeckersb/libvirt,VenkatDatta/libvirt,bjzhang/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,eskultety/libvirt,shugaoye/libvirt,emaste/libvirt,agx/libvirt,crobinso/libvirt,zippy2/libvirt,bjzhang/libvirt,datto/libvirt,jeckersb/libvirt,warewolf/libvirt,VenkatDatta/libvirt