Bug#923249: [Pkg-libvirt-maintainers] Bug#923249: libvirt0: libvirt sets disable_ipv6 on bridge, entirely breaking internal IPv6 networking

[Ralf Jung]

Btw, I reported this upstream at
<https://bugzilla.redhat.com/show_bug.cgi?id=1680681>, and made some headway
debugging things there.

; Ralf