/etc/neutron/neutron_vpnaas.conf is in python-neutron-vpnaas 2:12.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | [DEFAULT]
[service_providers]
#
# From neutron.vpnaas
#
# Defines providers for advanced services using the format:
# <service_type>:<name>:<driver>[:default] (multi valued)
#service_provider =
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