systemd: start libvirtd after network

Domains configured with autostart may fail to start if the host
network stack has not been started.  E.g. when using bridged
networking autostarting a domain can fail with

libvirtd[1403]: 2012-06-20 13:23:49.833+0000: 1485: error :
qemuAutostartDomain:177 : Failed to autostart VM 'test': Cannot get
interface MTU on 'br0': No such device

daemon/libvirtd.service.in

@@ -6,6 +6,7 @@
 [Unit]
 Description=Virtualization daemon
 Before=libvirt-guests.service
+After=network.target
 
 [Service]
 EnvironmentFile=-/etc/sysconfig/libvirtd