The old code assumed _neutron_service_plugin_class_add presence, as well
as used a configuration file path that is not standard (under
/etc/neutron/services/ instead of /etc/neutron/metering_agent.ini).
The patch untangles metering configuration in the new library from that
old and bad code, and reimplements it inline.
This should help the effort to switch gate from lib/neutron-legacy to
lib/neutron.
Change-Id: I0d235498af4b6a70bd5dae6ea178d5aa8ba41e80