In a multi-node environment, a node may have the neutron-
openvswitch-agent running but not the neutron API server.
The agent uses neutron.conf as one of the configuration
files. Devstack sets up neutron.conf only when q-svc is
enabled. Neutron.conf also needs to be configured when
q-agt is enabled.
Change-Id: I3d454caff0b49a61ee1a78f68b1bca98e29f21de
Closes-Bug: 1184064