[libvirt] Add hook for network update event

Hey guys, This is duplicate from Bugzilla (https://bugzilla.redhat.com/show_bug.cgi?id=1181539), but I would like to ask you if my patch looks good. "virsh net-update" starts iptables rules reload for NAT network system. This event doesn't start network hooks, so all previous custom iptables rules become unavailable. How reproducible: Add "/etc/libvirt/hooks/network" with: ------------------------------------------- #!/bin/bash echo "`date` $0 $@" >> /var/log/libvirt.log ------------------------------------------- Restart libvirt and run virsh net-update command: virsh net-update default modify ip-dhcp-host --live --config "<host mac='52:54:00:97:eb:95' name='test' ip='192.168.122.253'/>" Actual results: /var/log/libvirt.log log file doesn't contain events from virsh net-update command. Expected results: /var/log/libvirt.log log file should contain event. Additional info: This bug brakes iptables hooks hack for FORWARD chain with NAT network. Patch file is attached. It was tested with libvirt 1.2.15