Re: [libvirt] [PATCH] qemu: fail on attempts to use <filterref> for non-tap network connections

nwfilter uses iptables and ebtables, which only work properly on tap-based network connections (*not* on macvtap, for example), but we just ignore any <filterref> elements for other types of networks, potentially giving users a false sense of security. This patch checks the network type and fails/logs an error if any domain <interface> has a <filterref> when the connection isn't using a tap device. This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1180011