Comment # 6 on bug 1174936 from Tom������������ Ba������ant

To me this one boils down to creating a new section "Managing network bridges
with YNetwork Manager" inspired by the section "Setting up a bridge with
NetworkManager" at
https://www.happyassassin.net/posts/2014/07/23/bridged-networking-for-libvirt-with-networkmanager-2014-fedora-21/

@Jim, agree?