/etc/libvirt/libvirt.conf is in libvirt-bin 1.2.2-0ubuntu13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This can be used to setup URI aliases for frequently
# used connection URIs. Aliases may contain only the
# characters a-Z, 0-9, _, -.
#
# Following the '=' may be any valid libvirt connection
# URI, including arbitrary parameters
#uri_aliases = [
# "hail=qemu+ssh://root@hail.cloud.example.com/system",
# "sleet=qemu+ssh://root@sleet.cloud.example.com/system",
#]
#
# This can be used to prevent probing of the hypervisor
# driver when no URI is supplied by the application.
#uri_default = "qemu:///system"
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