neutron-api needs to load config files when deployed under
WSGI process. This patch will do this. neutron-rpc-server
also need to be aware of plugin extension.
uWSGI seems not happy with eventlet.GreenPool. So this patch
will switch to futurist.ThreadPoolExcutor for ML2 OVO push
notification.
Partially-implements: blueprint run-in-wsgi-server
Change-Id: Ia2659c9c8f1deeceefc1c75f1149a1e47c91e7a9
Closes-Bug: #1708389
2f98f56cb5