Libvirt is moving around the wrong config file

Libvirt uses libvirtd.conf not libvirt.conf. Currently,
the config file get copied to '/etc/libvirt/libvirt.conf' and
libvirt creates its own libvirtd.conf and ignores the
configured libvirt.

Change-Id: I7a55b92c33ade72b7ac8ba028c67313479ad8343
Co-Authored-By: Ian Main <imain@redhat.com>
Closes-Bug: #1486100

docker/common/nova/nova-libvirt/config-external.sh

 #!/bin/bash
-SOURCE="/opt/kolla/libvirt/libvirt.conf"
-TARGET="/etc/libvirt/libvirt.conf"
+SOURCE="/opt/kolla/libvirt/libvirtd.conf"
+TARGET="/etc/libvirt/libvirtd.conf"
 OWNER="libvirt"
 
 if [[ -f "$SOURCE" ]]; then