/usr/share/tripleo-image-elements/nova-kvm/install.d/81-nova-kvm is in python-tripleo-image-elements 0.7.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #!/bin/bash
set -eux
# We delete the default libvirt network to avoid a possible
# collision with the network on the seed host machine
rm -f /etc/libvirt/qemu/networks/autostart/default.xml
rm -f /etc/libvirt/qemu/networks/default.xml
SCRIPTDIR=$(dirname $0)
if [ -f /etc/sysconfig/libvirtd ]; then
    install -D -g root -o root -m 0755 ${SCRIPTDIR}/default_libvirtd /etc/sysconfig/libvirtd
elif [ -f /etc/default/libvirt-bin ]; then
    install -D -g root -o root -m 0755 ${SCRIPTDIR}/default_libvirt_bin /etc/default/libvirt-bin
else
    echo "Unsupported libvirtd/libvirt-bin configuration."
    exit 1
fi
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