This makes NM work in a container out of box. Please include this patch: http://people.freedesktop.org/~lkundrak/libvirt/0005-lxc-don-t-up-the-veth-interfaces-unless-explicitly-a.patch
Pushes to the libvirt 1.2.13-maint branch now
libvirt-1.2.13.1-2.fc22 has been submitted as an update for Fedora 22. https://admin.fedoraproject.org/updates/libvirt-1.2.13.1-2.fc22
Package libvirt-1.2.13.1-2.fc22: * should fix your issue, * was pushed to the Fedora 22 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing libvirt-1.2.13.1-2.fc22' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-9593/libvirt-1.2.13.1-2.fc22 then log in and leave karma (feedback).
libvirt-1.2.13.1-2.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.