/etc/nova/nova-compute.conf is in nova-compute-kvm 2:14.0.0-4+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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compute_driver=libvirt.LibvirtDriver
neutron_ovs_bridge=br-int
[libvirt]
virt_type=kvm
vif_driver=nova.virt.libvirt.vif.LibvirtGenericVIFDriver
use_virtio_for_bridges=true
# This may be needed for
#cpu_mode=host-passthrough
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